Vengeance Valley (1951) is a Western film starring Burt Lancaster, based on the novel by Luke Short. Metro-Goldwyn-Mayer failed to renew the copyright on this film in 1978, so it is now in the public domain in the United States.
Owen Daybright is ranch foreman and Lee Strobie works by his side for Colorado cattleman Arch Strobie, who adopted both of them, 15 years apart. Arch has no sons of his own.
Lily Fasken gives birth and won't identify the father. Her brothers Hub and Dick believe that Owen is responsible. They know he gave her $500 to take care of the baby, but aren't aware Owen did so on Lee's behalf. The brothers pick a fight with Owen and are put behind bars for a week, vowing to get even as soon as they're out.
Lee is married to Jen, who is unaware he has been unfaithful. Lee also is ambitious. He says he'll leave forever unless Arch grants him a half-interest in the ranch, now rather than later. Arch agrees, saying Owen can inherit the other half after the old man dies....