Ridin' Thunder

When Bill Croft, a notorious gunfighter, is bushwhacked, innocent rancher Frank Douglas is accused of the crime on circumstantial evidence and sentenced to be hanged. Jack Douglas, Frank's son, sets out to prove his father's innocence with the help of Jean, the murdered man's daughter; Jack eventually apprehends the killer and forces him to confess, but the sheriff is unable to stop the execution without an official pardon. Jack rides to find the governor, and after a wild cross-country race with a train, he gets the pardon and returns home in time to save his father's life.