Impact (1949)

Brian Donlevy stars as Walter Williams, a successful businessman whose faithless wife (Helen Walker) sets him up to be murdered by her sleazebag lover. Bludgeoned unconscious and left for dead, Walter catches a ride in a moving van and discovers that his assailant was killed in an accident immediately afterward. Finding a body burned beyond recognition, the authorities initially conclude that the dead man is Walter, who pauses awhile in a small town in Idaho, working as a mechanic and meeting a local girl (Ella Raines). When his wife is charged with murder he returns to his old life only to experience a sudden reversal. Charles Coburn– whose screen persona is a thousand times more appealing than his real-life political convictions– plays the Irish-American detective on the verge of retirement whose instincts and energy help solve the riddle.