Clockwork Terror (1973)

Anna Vernia, a beautiful young nurse, receives a medal for her dedication to patient needs at the hospital where she works. She is dating Victor Sender, a doctor who also works there. Crime is rampant in the city; gangs of young thugs attack families at random. Because of this, Victor is working on a project to electro-shock violent criminals. By using this therapy he hopes to turn them into model citizens. Recently, there has been a rash of unresolved killings, the victims are always young men. These slayings have been attributed to a serial killer, probably a sadistic homosexual. But it is Anna who is the perpetrator. She lures young men to her bed in her sprawling mansion and then dispatches them while they are in their blissful afterglow. She views it as an ultimately desirable able way to die. Things become complicated when David, a former gang member witnesses her execute a young man. He begins to extort money in exchange for his silence. His former gang leader sees him on a new motorcycle and concludes that David purchased it with some missing gang monies.