Man Who Cheated Himself, The (1950) - He's Bought A Gun

We’ve just met John Dall as eager new San Francisco homicide detective Andy Cullen, and Lee J. Cobb as his brother Ed, who’ll be supervising him, and who offers his wedding gift, then phones his anxious married mistress Lois (Jane Wyatt), having deduced that she called earlier, then meets the fianceè Janet (Lisa Howard), early in The Man Who Cheated Himself, 1951.