Fay Allison (Sue England) and her roommate Anita (Jean Willes) are found unconscious by Fay's aunt, Louise Marlow (Frances Bavier), who calls her attorney Perry Mason in desperation. In the girls' apartment Perry and Della discover a key that leads them to the body of Carver Clement (John Holland). Someone has left a crimson kiss on Carver's forehead and planted evidence that incriminates Fay. Perry must use all his skills to defend his young client.