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After stealing a million dollars from the burning ocean liner "Morro Castle", Cuban thief Valentine Ferrar is pursued by by both Elliot Ness (Robert Stack) and underworld "judge" Foley (Richard Devon). Seeking a means of escape without detective, Ferrar answers a classified ad from widow Lucy Wagnall (Joan Blondell), who is seeking a driver for her annual cross-country trip to celebrate her wedding anniversary. Things take a macabre, Hitchcock-like turn when Mrs. Wagnall reveals that she has plans of her own for the unwitting Ferrar--leading to a fateful rendezvous between the duplicitous widow and the sinister Foley.