Betty Deckard, Michael W. Deckard, Frank Pershing, Donna Shields and Brian Shields (the plaintiffs) appeal from the order of the district court dismissing their claims against General Motors Corporation (GM) arising from an automobile accident. We reverse.
I.
On August 16, 1997, Karen Watson, while driving her 1992 Toyota Tercel, failed to stop at a stop sign and struck a 1994 GMC Jimmy truck driven by Betty Deckard. The Jimmy was occupied by passengers Donna Shields, Brandi Shields and Sherry Pershing (who was pregnant with Adrianna 1 ). As a result of the impact of the collision, the Jimmy rolled over and all of its occupants, except Brandi, were ejected. Betty Deckard and Donna Shields were seriously injured; Sherry and Adrianna Pershing were killed.
On February 4, 1998, the plaintiffs in settling their claims against Karen Watson and her insurer, United Farm Bureau Mutual Insurance Company (Farm Bureau), signed release agreements. Betty and her husband, Michael Deckard, and Donna and her husband, Brian Shields, signed the same form release agreements that purported to release:
... United Farm Bureau Mutual Insurance and all other persons, firms or corporations liable or who might be claimed to be liable ... from any and all claims, demands, damages, actions, causes of action or suits of any kind or nature whatsoever, on their own behalf and on behalf of their children, and particularly on account of all injuries, known and unknown ... which resulted or may in the future develop from an accident which occurred on or about the 16th day of August, 1997, in or near Bedford, Lawrence County, Indiana
Separate App. to Appellant’s Br., Exhibit 4, at 3 (emphasis added). Although Betty Deckard and Donna Shields allegedly incurred over $200,000 and $40,000, respectively, in medical expenses, the Deckards and the Shields settled their claims for $5,000 each.
Frank Pershing also signed release agreements to settle claims arising from the death of his wife Sherry and his unborn daughter Adrianna. With respect to the claims arising from the death of Sherry, Frank purported to release:
... United Farm Bureau Mutual Insurance and all other persons, firms or corporations liable or who might be claimed to be liable ... on account of all injuries, death and damages suffered directly to Sherry Pershing and for the loss of services of said Sherry Pershing to Frank Pershing which resulted or may in the future develop from an acei- *560 dent which occurred on or about the 16th day of August, 1997, in or near Bedford, Lawrence County, Indiana
Id. at 1 (emphasis added). Frank Pershing received $42,500 in settlement of these claims with respect to Sherry. He received an additional $42,500 in exchange for settling the claims arising out of the death of Adrianna. 2
On August 12, 1999, the plaintiffs filed an automotive products liability suit against GM claiming that the Jimmy was improperly designed. On March 1, 2000, GM filed a motion to dismiss pursuant to Rule 12(b)(6) of the Federal Rules of Civil Procedure, alleging that the release agreements that the plaintiffs entered into with Farm Bureau also released GM.
On March 27, 2000, Farm Bureau entered into agreements captioned “Rescission Agreement and Release” with the plaintiffs, purporting to rescind the original release agreements and to enter into new release agreements that specifically excluded GM from being released.
On March 31, 2001, the district court entered a judgment and order granting GM’s motion. The district court concluded that the plaintiffs intended to release GM when they signed the original release agreements with Farm Bureau. The district court also rejected the plaintiffs’ attempt to rescind the original release agreements. The order was made final pursuant to Rule 54(b) of the Federal Rules of Civil Procedure on May 29, 2001. The plaintiffs appeal.
II.
This court has jurisdiction under 28 U.S.C. § 1291 over an appeal from a final order of a district court. Although the district court’s order is cast in terms of a motion to dismiss, both parties submitted evidence outside the pleadings for the district court’s consideration, and so, pursuant to Rule 12(b) of the Federal Rules of Civil Procedure, GM’s Motion to Dismiss was converted into a Motion for Summary Judgment. A motion to dismiss was improper since release is an affirmative defense, Fed.R.Civ.P. 8(c), and the existence of a defense does not undercut the adequacy of the claim.
See Gomez v. Toledo,
A.
There are two sets of release agreements in this case. GM argues that the original release agreements control the disposition of this case, while the plaintiffs argue that the new release agreements *561 (which specifically exclude GM from being released) control. The plaintiffs also argue that the district court erred in concluding that the rescission agreements that they entered into with Farm Bureau did not effectively rescind the original release agreements. We conclude that the rescission agreements did not rescind the original release agreements and that the original release agreements control this case.
The purpose of. rescission is to return contracting parties to their pre-contract position.
Am. Standard Ins. Co. v. Durham,
While both parties, on appeal, disagree about whether the parties to the original release agreements could return to their pre-contract positions, both parties failed to address whether the plaintiffs could enter into any rescission agreements once GM acted upon the original release agreements.
“Generally, only parties to a contract or those in privity with the parties have rights under the contract.”
OEC-Diasonics, Inc. v. Major,
One not a party to the contract may nonetheless enforce it by demonstrating that .the parties intended to protect him under the agreement by the imposition of a duty in his favor. To be enforceable, it must clearly appear that it was the purpose or a purpose of the contract to impose an obligation on one of the contracting parties in favor of the third party. It is not enough that performance of the contract would be of benefit to the third party. It must appear that it was the intention of one of the parties to require performance or some part of it in favor of such third party and for his benefit, and that the other party to the agreement intended to assume the obligation thus imposed.
Id.
at 1315.
OEC-Diasonics
recognizes that third-party beneficiary contracts exist under Indiana law. Stated in another way, a third-party beneficiary contract is formed when (1) the parties intend to benefit a third party, (2) the contract imposes a duty on one of the parties in favor of the third party and (3) the performance of the terms of the contract renders a direct benefit to the third party.
Kiltz v. Kiltz,
Under Indiana law,
“the parties to a contract entered into for the benefit of a third person may rescind, vary, or abrogate the contract as they see fit, without the assent of the third person, at any time before the contract is accepted, adopted, or acted upon by [the third person], and such *562 rescission deprives the third person of any rights under or because of such contract.”
Seavey v. Estate of Fanning (In re Estate of Fanning),
B.
The district court concluded that the original release agreements unambiguously released GM. On appeal, the plaintiffs argue that the court erred in reaching this conclusion. Further, the plaintiffs contend that the district court erred in failing to consider extrinsic evidence on whether the parties intended to release GM.
Under Indiana law, release agreements are to “be interpreted in the same manner as any other contract document, with the intention of the parties regarding the purpose of the document governing.”
Huffman v. Monroe County County. Sch. Corp.,
The original release agreements stated that the plaintiffs were releasing
*563
“all other persons, firms or corporations liable or who might be claimed to be liable ... on account of all injuries ... which might have resulted ... from an automobile accident.” The intermediate appellate courts of Indiana have held that such language in a release agreement is plain and unambiguous in its intent to release third parties who satisfy that language.
See Estate of Kelly Spry v. Greg & Ken, Inc.,
Parol evidence in Indiana follows the general rule that parol evidence may not be used “to vary or contradict a written contract complete on its face.”
State Highway Comm’n v. Wilhite,
In
Wilhite,
the State Highway Commission appealed from an award of the Industrial Board granting compensation for personal injuries suffered in an automobile accident to the appellee, Wilhite. Wilhite was employed by the Commission to operate a mowing machine drawn by a team of horses. He had sustained injuries when a motor vehicle driven by Wilbur Shelton for Samuel Barnett had “collided with the team, killing one of the horses, damaging the harness and moving machine, and inflicting personal injuries upon the appel-lee.”
Wilhite,
It is further understood and Agreed, that this release is intended to cover all actions, causes of action, claims and demands for, upon, or by reason of any damage, loss or injury which may be traced either directly or indirectly to the aforesaid accident, as now appearing or as may appear at any time in the future, no matter how remotely they may be *564 related to the aforesaid accident. And this Release is executed with the full knowledge and understanding on my or our part that there may be more serious consequences, damages or injuries as the result of the accident aforementioned than now appear; and that more serious and permanent injuries, even to the extent of death, may result from the injuries sustained in the accident aforementioned.
Id. at 281-82 (emphasis added). The Commission argued that this release covered Wilhite’s personal injury claims. Thus, under a state law that barred double recovery, the Commission argued that Wil-hite was not entitled to compensation on account of his personal injuries since he already received compensation for his personal injuries as part of his settlement with Barnett.
Despite the plain language of the release, the Supreme Court of Indiana permitted the admission of parol evidence that supported “a finding that the release of the appellee’s claim for personal injuries was not within the contemplation of the parties thereto, and that the part thereof referring to personal injuries was included through mutual mistake of the parties.” Id. at 282. Wilhite had sought to admit evidence that his “personal injuries were not at that time thought to be consequential and that no mention was made of these [injuries],” that his “personal injuries were not mentioned” in a conversation between him and Barnett’s insurance carrier and that he had “received a letter from the insurance company offering him $116 in settlement of his claim for the loss of his horse and the damage to his harness and mowing machine.” Id. at 281. The court held that this evidence, “offered by the appellee as to the circumstances under which the release was executed[,] was proper.” Id. at 282. Therefore, under Wilhite, the district court here should have considered parol evidence in determining whether the plaintiffs intended to release GM.
GM argues that
Wilhite
and its predecessors do not apply to this case for three reasons. First, GM argues that it is not a stranger to the contract because it is within the class of “all corporations liable or might be claimed to be liable.” This is unpersuasive. GM is a stranger to the contract because it was not involved in the drafting of the agreements, did not sign the agreements and was not in privity with any of the parties that did so.
Black’s Law Dictionary 1421 (6th
ed.1990) (defining “strangers” as a term intended to refer to third persons generally and “[i]n its general legal signification ... opposite to the word ‘privy.’ ”);
id.
at 1122,
Because the district court did not examine any parol evidence, it is difficult for us to determine whether there was sufficient evidence to support a finding that the plaintiffs did not intend to release GM from claims arising out of the automobile accident. We do, however, note some factors which may bear on the questions of intent. Putting aside the plaintiffs’ other claims against GM and looking only at the actual medical expenses incurred by Betty Deckard and Donald Shields, the huge disparity between those expenses (over $240,000) and the amounts paid out in settlement to them ($10,000) may indicate that Deckard and Shields did not intend to release their automotive liability claims against GM. Further, the December 18, 1997, letter from Farm Bureau to the plaintiffs also indicates that the intent of the parties was to release only the named insureds (Mr. and Mrs. Watson) and the permissive user (Karen Watson, the driver of the car during the accident) from liability and not to release GM. 5 Such a letter, being a prior expression of the parties’ intent, would be admissible as parol evidence in this ease. Finally, a powerful bit of evidence could be inferred from the answer to the question: “Was Watson at any risk of suit by GM?” The reason why an insurer such as Farm Bureau might want a general release is to protect its insured Watson, the reckless driver. There would be little point in settling Deckard v. Watson if the next suit would be GM v. Watson. If there was no risk that GM would proceed against Watson or the insurer, this would be strong evidence that the original release fails to reflect the actual deal, for no one had any reason to make a gift to GM. If the parties can with such parol evidence as is admissible in Indiana prove that they did not intend to release GM, then the plaintiffs have asserted a set of facts that, if true, would entitle them to relief. Thus, the district court erred in dismissing the plaintiffs’ complaint.
*566 III.
For the foregoing reasons, we REVERSE the judgment of the district court and REMAND for further proceedings not inconsistent with this opinion.
Notes
. Adrianna is referred to in some documents as Andrea or Adriana. We use the name Adrianna because that is the name the appellants use in their appellate brief.
. Frank Pershing signed a different, more narrowly worded, release agreement with respect to the claims arising from Adriarma's death. That release agreement is not the subject of this appeal. Pershing's claims against GM on behalf of Adrianna are still pending.
. The plaintiffs’ simultaneous entries into rescission agreements and into new release agreements may be seen as an attempted modification of the original release agreements.
See
Restatement (Second) of Contracts, § 89 cmt. b (1981) (noting that parties occasionally seek to modify an existing contract by simultaneously rescinding the existing contract and entering into a new contract). Interpreting the transaction between the plaintiffs and Farm Bureau in this manner would allow the intent of the parties to be effectuated. While contracts not fully performed may be modified without new consideration,
see id.
§ 89, the plaintiffs would still be barred from modifying the original release agreements without the assent of GM under Indiana law,
see Estate of Fanning,
. The plaintiffs also argue that the district court abused its discretion by not rescinding the original contract on equitable grounds. In light of our holding that the rescission agreements would not be valid absent the assent of GM, the district court did not abuse its discretion in refusing to rescind the original release agreements.
. We reach this determination without reference to the purported "Rescission Agreement and Release" documents. These documents are not barred by the parol evidence rule because they were written after the original agreements were signed. They might, however, be barred by the general rule that a court should only look within the "four corners” of a document.
