Fred MacMurray, Kim Novak & E.G. Marshall in Pushover (1954)

A carefully planned bank heist by hoodlum Harry Wheeler (Paul Richards) and his partner leaves a policeman dead and $210,000 stolen. The investigation headed by Police Lt. Carl Ekstrom (E.G. Marshall) identifies Wheeler as the culprit, and Eckstrom charges detective Paul Sheridan (Fred MacMurray) with an undercover assignment to befriend Wheeler's sultry girlfriend, Lona McLane (Kim Novak). A powerful attraction develops between Paul and Lona, and soon they have a torrid affair. Eckstrom, Paul and his partner, Rick McAllister (Philip Carey) stakeout Lona's apartment, and wait for Wheeler. Lona leaves the apartment, and Paul follows her. She drives to his apartment. He meets her there, and she asks if he is a cop. Paul admits to it, but insists he's been seeing her for personal reasons. Lona admits she's frightened of Wheeler and insists she didn't know about his criminal activities until after the bank robbery. Lona asks what would happen to Wheeler if she turned him in.