Detour: A Manhattan night-club piano player hitchhikes to Hollywood to meet up with his girl friend. Along the way, he's picked up by a driver who winds up dead. The hitchhiker assumes the dead driver's identity but winds up being blackmailed. The scar: An ex-medical student in trouble with gambling debts kills a psychiatrist who is his exact look-alike, except for a scar on the doctor's cheek. The student impersonates the dead psychiatrist, but mistakenly makes his own scar on the wrong cheek. It is not long before the doctor's secretary is on to him and he discovers the doctor had a few gambling debts himself. D.O.A.: An accountant discovers he has only a week to live after he is poisoned. Together with his secretary, he tries to beat the clock to find out who poisoned him--and why--before it's too late.