Tarot Killer.

When the CEO of a film production company is about to retire, a fast mover sleeps with her to get the job and dumps the front runner, Carla, who he is also sleeping with. Carla hires a psycho to kill him and leave a Tarot card on the body. The killer blackmails Carla, so she has his girlfriend killed. The police and a couple of amateur detectives eventually stumble into solving the case.