Bell, Judge:
This is an action in equity by purchasers of real estate to clear title. The plaintiffs, Jeremy G. Wilson and Walter Lee McRacken, doing business as Chester Street Associates, prayed for a declaration that Mary Ann Landstrom had conveyed to them all of her interest in the premises at 62 Downing Street in the City of Columbia. Landstrom, the defendant and seller, counterclaimed for payment of the balance of the purchase price plus interest or rescission and restitution. The circuit court decreed that Chester Street Associates owns the property in fee simple, subject to a mortgage held by Landstrom and that Landstrom is barred from asserting any interest in the property except to the extent of her mortgage. Relief on the counterclaim was denied. Landstrom appeals. We affirm.
The facts are substantially undisputed. In July, 1979, Landstrom, who had moved from South Carolina in 1967 and now lives in California, listed her house at 62 Downing Street in Columbia with a local real estate broker. In the listing agreement Landstrom reserved the right to sell the house to the tenants then occupying it. For this purpose she contacted Harry Dent, her former employer in South Carolina. Dent agreed to negotiate with the tenants on her behalf. Pursuant to this arrangement, Landstrom executed a power of attorney authorizing Dent to sell the house “upon such terms and conditions as he may see fit.” The power of attorney was witnessed but not probated.
Landstrom’s tenants decided not to purchase the house. However, the realtor obtained Chester Street Associates as a prospective purchaser. The realtor called Landstrom to inform her of Chester Street Associates’ offer on the house. After discussing the matter by telephone with Dent, Landstrom authorized him to sign a contract of sale prepared by the realtor.
On September 17,1979, Dent executed a contract to sell the house to Chester Street Associates. The contract provided for [263]*263a purchase price of $33,000 with $500 to be paid as earnest money and $22,000 to be paid upon delivery of a deed. The following financing term was also contained in the contract:
Seller agrees to accept second mortgage at 8% for five years with ballon [sic] payment payable on October 1, 1984, in amount of $10,500.00.
After the contract was signed by Dent it was forwarded to Landstrom. Closing was held on October 1,1979. Dent delivered a deed to Chester Street Associates and received in return a document entitled “Second Mortgage” which included the following provision:
This is a second mortgage and shall be subject and subordinate to any first mortgage that Mortgagor may now have or subsequently execute.
No other mortgage was placed on the property at the time of closing.
When Landstrom received the closing papers she consulted an attorney in California about the mortgage. After learning that her mortgage might be subordinated to a future mortgage placed on the property, she became concerned about the sufficiency of her security. She then destroyed the original power of attorney, refusing to have it probated so Chester Street Associates could record it. This action followed.'
At a reference before the master in equity, Landstrom presented no testimony except her own deposition. The master recommended an order confirming Chester Street Associates’ title. He found no evidence that Chester Street Associates acted in bad faith, a finding to which Landstrom took no exception. With minor exceptions the circuit court adopted the master’s findings of fact and conclusions of law. The court entered its order confirming title in Chester Street Associates and barring any claim of Landstrom except to the extent of her “second mortgage.”
Landstrom’s appeal raises three questions for our review: (1). did the delivery of the so-called “second mortgage” constitute a breach of contract by Chester Street Associates; (2) did Dent have authority, actual or apparent, to accept the “second mortgage” on Landstrom’s behalf and to deliver her deed in exchange for it; and (3) are Chester Street Associates barred from relief by the doctrine of “unclean hands.”
[264]*264I.
If Dent was acting within the scope of his authority when he accepted the “second mortgage” at closing, it seems clear Landstrom can claim no breach of contract. The deed and mortgage delivered and accepted at closing, not the prior contract, represented the final bargain of the parties. Having accepted the mortgage through her attorney, Landstrom cannot now rely on the terms of a prior executory contract as to the mortgage. The applicable rule has been fully expounded by our Supreme Court in the case of Charleston & Western Carolina Railway Co. v. Joyce, 231 S. C. 493, 99 S. E. (2d) 187 (1957):
The doctrine of merger is founded upon the privilege, which parties always possess, of changing their contract obligations by further agreements prior to performance. The execution, delivery, and acceptance of a deed varying from the terms of the antecedent contract indicates an amendment of the original contract, and generally the rights of the parties are fixed by their expressions as contained in the deed. [Citations omitted.] * * * *
Where there is no mistake or fraud a deed executed subsequently to the making of an executory contract for the sale of land is generally regarded as conclusive evidence of a previous modification of the executory contract. A deed executed subsequent to the making of an executory contract for the sale of land supersedes that contract____
231 S. C. at 504-505, 99 S. E. (2d) at 193 (quoting with approval from Snyder v. Roberts, 45 Wash. (2d) 865, 278 P. (2d) 348 (1955), and from 55 Am. Jur., Vendor and Purchaser, Para. 327).
The same rule applies to mortgages. Jordan v. Flynt; 240 Ga. 359, 240 S. E. (2d) 858 (1977) (plurality opinion); Norment v. Turley, 24 N. M. 526, 174 P. 999 (1918); Timms v. Shannon, 19 Md. 296 (1862).
In this case Dent accepted the “second mortgage” as Landstrom’s attorney in fact. Landstrom makes no claim that Dent, a lawyer, was mistaken or deceived as to its contents. The mortgage would be binding on Landstrom if she personally had accepted it at closing. In principle the [265]*265result is the same whether Landstrom was acting through an attorney or in person. To prevail on her claim, Landstrom must show not that the terms of the mortgage differed from those of the contract, but that Dent had no authority to accept the mortgage as tendered.
II.
This leads to Landstrom’s second argument: that there was no effective delivery of the deed and mortgage because Dent had no actual or apparent authority to accept the mortgage. Her contention is refuted by the terms of the power of attorney, which states, in pertinent part:
... I, Mary Ann Landstrom,... appoint Harry S. Dent, my true and lawful attorney with full power and authority:
1. To bargain, sell, convey and deliver to whomever he may see fit, upon such terms and conditions as he may see fit, my home place located at 62 Downing Street, Columbia, South Carolina, and in general to take any action whatsoever in regard to said property which I myself could take; and
5.
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Bell, Judge:
This is an action in equity by purchasers of real estate to clear title. The plaintiffs, Jeremy G. Wilson and Walter Lee McRacken, doing business as Chester Street Associates, prayed for a declaration that Mary Ann Landstrom had conveyed to them all of her interest in the premises at 62 Downing Street in the City of Columbia. Landstrom, the defendant and seller, counterclaimed for payment of the balance of the purchase price plus interest or rescission and restitution. The circuit court decreed that Chester Street Associates owns the property in fee simple, subject to a mortgage held by Landstrom and that Landstrom is barred from asserting any interest in the property except to the extent of her mortgage. Relief on the counterclaim was denied. Landstrom appeals. We affirm.
The facts are substantially undisputed. In July, 1979, Landstrom, who had moved from South Carolina in 1967 and now lives in California, listed her house at 62 Downing Street in Columbia with a local real estate broker. In the listing agreement Landstrom reserved the right to sell the house to the tenants then occupying it. For this purpose she contacted Harry Dent, her former employer in South Carolina. Dent agreed to negotiate with the tenants on her behalf. Pursuant to this arrangement, Landstrom executed a power of attorney authorizing Dent to sell the house “upon such terms and conditions as he may see fit.” The power of attorney was witnessed but not probated.
Landstrom’s tenants decided not to purchase the house. However, the realtor obtained Chester Street Associates as a prospective purchaser. The realtor called Landstrom to inform her of Chester Street Associates’ offer on the house. After discussing the matter by telephone with Dent, Landstrom authorized him to sign a contract of sale prepared by the realtor.
On September 17,1979, Dent executed a contract to sell the house to Chester Street Associates. The contract provided for [263]*263a purchase price of $33,000 with $500 to be paid as earnest money and $22,000 to be paid upon delivery of a deed. The following financing term was also contained in the contract:
Seller agrees to accept second mortgage at 8% for five years with ballon [sic] payment payable on October 1, 1984, in amount of $10,500.00.
After the contract was signed by Dent it was forwarded to Landstrom. Closing was held on October 1,1979. Dent delivered a deed to Chester Street Associates and received in return a document entitled “Second Mortgage” which included the following provision:
This is a second mortgage and shall be subject and subordinate to any first mortgage that Mortgagor may now have or subsequently execute.
No other mortgage was placed on the property at the time of closing.
When Landstrom received the closing papers she consulted an attorney in California about the mortgage. After learning that her mortgage might be subordinated to a future mortgage placed on the property, she became concerned about the sufficiency of her security. She then destroyed the original power of attorney, refusing to have it probated so Chester Street Associates could record it. This action followed.'
At a reference before the master in equity, Landstrom presented no testimony except her own deposition. The master recommended an order confirming Chester Street Associates’ title. He found no evidence that Chester Street Associates acted in bad faith, a finding to which Landstrom took no exception. With minor exceptions the circuit court adopted the master’s findings of fact and conclusions of law. The court entered its order confirming title in Chester Street Associates and barring any claim of Landstrom except to the extent of her “second mortgage.”
Landstrom’s appeal raises three questions for our review: (1). did the delivery of the so-called “second mortgage” constitute a breach of contract by Chester Street Associates; (2) did Dent have authority, actual or apparent, to accept the “second mortgage” on Landstrom’s behalf and to deliver her deed in exchange for it; and (3) are Chester Street Associates barred from relief by the doctrine of “unclean hands.”
[264]*264I.
If Dent was acting within the scope of his authority when he accepted the “second mortgage” at closing, it seems clear Landstrom can claim no breach of contract. The deed and mortgage delivered and accepted at closing, not the prior contract, represented the final bargain of the parties. Having accepted the mortgage through her attorney, Landstrom cannot now rely on the terms of a prior executory contract as to the mortgage. The applicable rule has been fully expounded by our Supreme Court in the case of Charleston & Western Carolina Railway Co. v. Joyce, 231 S. C. 493, 99 S. E. (2d) 187 (1957):
The doctrine of merger is founded upon the privilege, which parties always possess, of changing their contract obligations by further agreements prior to performance. The execution, delivery, and acceptance of a deed varying from the terms of the antecedent contract indicates an amendment of the original contract, and generally the rights of the parties are fixed by their expressions as contained in the deed. [Citations omitted.] * * * *
Where there is no mistake or fraud a deed executed subsequently to the making of an executory contract for the sale of land is generally regarded as conclusive evidence of a previous modification of the executory contract. A deed executed subsequent to the making of an executory contract for the sale of land supersedes that contract____
231 S. C. at 504-505, 99 S. E. (2d) at 193 (quoting with approval from Snyder v. Roberts, 45 Wash. (2d) 865, 278 P. (2d) 348 (1955), and from 55 Am. Jur., Vendor and Purchaser, Para. 327).
The same rule applies to mortgages. Jordan v. Flynt; 240 Ga. 359, 240 S. E. (2d) 858 (1977) (plurality opinion); Norment v. Turley, 24 N. M. 526, 174 P. 999 (1918); Timms v. Shannon, 19 Md. 296 (1862).
In this case Dent accepted the “second mortgage” as Landstrom’s attorney in fact. Landstrom makes no claim that Dent, a lawyer, was mistaken or deceived as to its contents. The mortgage would be binding on Landstrom if she personally had accepted it at closing. In principle the [265]*265result is the same whether Landstrom was acting through an attorney or in person. To prevail on her claim, Landstrom must show not that the terms of the mortgage differed from those of the contract, but that Dent had no authority to accept the mortgage as tendered.
II.
This leads to Landstrom’s second argument: that there was no effective delivery of the deed and mortgage because Dent had no actual or apparent authority to accept the mortgage. Her contention is refuted by the terms of the power of attorney, which states, in pertinent part:
... I, Mary Ann Landstrom,... appoint Harry S. Dent, my true and lawful attorney with full power and authority:
1. To bargain, sell, convey and deliver to whomever he may see fit, upon such terms and conditions as he may see fit, my home place located at 62 Downing Street, Columbia, South Carolina, and in general to take any action whatsoever in regard to said property which I myself could take; and
5. I do hereby expressly declare that the powers herein granted to aforesaid attorney shall not be construed as limited to those matters hereinabove specifically set forth but rather shall be construed to broadly include and embrace full and unlimited power and authority to do and perform on my behalf and in my place and stead and with equal validity any and all lawful acts or things which I could do if personally present, hereby ratifying and confirming whatsoever my said attorney shall do and may do, by virtue hereof, concerning the sale and transfer of my property located at 62 Downing Street, Columbia, South Carolina.
Landstrom concedes the power of Attorney was broad. She argues, however, that as long as Chester Street Associates “were not acting in good faith they had no right to rely upon his [Dent’s] authority, regardless of the breadth of the terms of the Power of Attorney.” In support of this position, Landstrom cites a section of Corpus Juris Secundum standing for [266]*266the proposition that a third party may be liable to a principal for participating in the fraud of his agent. See, 3 C.J.S., Agency § 456 (1973). Since Landstron neither alleged nor proved fraud on the part of Dent or Chester Street Associates, this argument does not avail her. Her suggestion that Chester Street Associates were not acting in good faith is likewise untenable in view of the finding of both the master and the circuit judge that there was no bad faith involved.
The dissenting opinion seeks to circumvent this problem by fashioning a different theory for disregarding Dent’s broad authority under the power of attorney. The dissent concludes Dent had no authority to accept a modification of the mortgage terms because the contract of sale contained a standard form merger clause stating “... there is no other agreement, oral or otherwise, modifying the terms hereunder.” Reliance on this language is misplaced.
A merger clause expresses the intention of the parties to treat the writing as a complete integration of their agreement.Pasquale FoodCo., Inc. v. L&H Airmotive, Inc., 51 Ala. App. 127, 283 So. (2d) 438 (1973), cert. denied, 291 Ala. 795, 283 So. (2d) 448 (1973); 4 Williston On Contracts § 633 (3rd ed. 1961). The terms of a completely integrated agreement cannot be varied or contradicted by parol evidence of prior or contemporaneous agreements not included in the writing. Armour Fertilizer Works v. Hyman, 120 S. C. 375, 113 S. E. 330 (1922); M’Dowall v. Beckly, 9 S.C.L. (2 Mill) 265 (1818). It is well settled, however, that this rule does not apply to subsequent modifications of the agreement. Koth v. County Board of Education of Jasper County, 141 S. C. 448, 140 S. E. 99 (1927). An integrated agreement may always be modified. In this case the mortgage was subsequent to the contract and, therefore, was not affected by the merger clause.
III.
Finally, Landstrom raises the defense of “unclean hands.” The doctrine of “unclean hands” precludes a plaintiff from recovering in equity if he acted unfairly in a matter that is the subject of the litigation to the prejudice of the defendant. Arnold v. City of Spartanburg, 201 S. C. 523, 23 S. E. (2d) 735 (1943). In this case two judges found there was no bad faith or inequitable conduct by Chester Street Associ[267]*267ates. We are bound by that finding given the lack of clear evidence in the record to the contrary. 'Ex parte Guaranty Bank and Trust Co., 255 S. C. 106, 177 S. E. (2d) 358 (1970).
Furthermore, it is difficult to see how Landstrom has been prejudiced. The record reveals that Chester Street Associates have given no other mortgage on the prop-
erty. Thus, regardless of the language of the sales contract or the “second mortgage,” Landstrom holds the only mortgage on the premises. Her security interest is not threatened by another existing mortgage. Moreover, there is nothing in the record proving her security interest will be destroyed in the future. Indeed, although we do not decide the issue in this case, it is not at all clear that a valid subordination agreement exists between Landstrom and the purchasers. See, e.g., Handy v. Gordon, 65 Cal. (2d) 578, 55 Cal. Rptr. 769, 422 P. (2d) 329 (1967). Conceivably, as events actually transpired, she is in a better position with respect to her security than she would have been under the terms of the contract. Since prejudice to the defendant is a necessary element of the “unclean hands” defense, the doctrine cannot bar relief on the facts before us.
For the reasons stated, the judgment of the circuit court is
Affirmed.
Sanders, C. J., concurs.
Gardner, J., dissents.