Sex therapist Rebecca Mathis (Shannon Tweed) returns in the third and final INDECENT BEHAVIOR film, which has the good doctor getting arrested on falsified drug charges as she then reluctantly accept a plea deal to be freed and have all of the charges dropped in favor of aiding a investigating police detective Frank Pavan (Sam Hennings) on his pursuit of a phantom killer who is killing female sex therapists and is both sexually mutilating them and tearing out their hearts.