The coincidental romance in the suspense story design turns the film's plot dramatically. Mavis Marlow, a beautiful nightclub singer, was strangled to death in her room at midnight. Bennett was seen hastily leaving Marlow's room, so the police focused on Bennett as the key suspect and pursued him. Bennett's wife, Catherine, and Marlow's husband, Marty, used their status as the best performing partners as a cover to conduct an investigation. During the investigation, Marty developed feelings for Catherine, which created a turning point in the case.