When insurance investigator Johnny Flood overhears Burt Hobson and Garth Briggs plotting the biggest bank heist in history, they catch him and try to kill him. Johnny escapes, but his wounds are so severe that he can share only a few details about the vault job with Robin Scott before he dies. Johnny's fiancée, Laurie Tibbs, blames Robin for his death and resolves to kill him. So do Hobson and Briggs, who discover that Johnny spoke to Robin before dying. Robin narrowly dodges Laurie's bullet, then persuades her to help him track down Johnny's killers. Her cooperation nearly costs her her life, and Robin guesses wrong about the vault job. Ironically, that wrong guess gives him the right answer—and leads him to the crooks just in time.