Four girls go on a romping weekend at a lake, and have car problems on the way home. A nice local boy takes them back to his farm, where he lives with his father. Something ghastly happens, but the father helps his son as he has in the past. When the boy meets a girl and begins falling in love, the father worries about a repeat performance.

A racist white serial killer known only as "Mac" is wreaking havoc throughout San Francisco while wearing black makeup and an afro wig. Police lieutenant Frank Savage is hot on his trail when Mac begins to reveal his motivations for the killings and escalates their game of cat and mouse.

A young woman is brought to an asylum to receive special treatment from a mysterious doctor. Dr. Spector does more than just run the hospital -- he offers his patients as sacrifices to Satan.