A broken heart sends a teenage temptress on the road to prostitution and murder in this surprisingly gritty exploitation drama. Kim (Jill Lansing) is a high school senior with a bad attitude that just gets worse after her boyfriend Kevin (Stuart Taylor) breaks up with her and starts dating Annette (Tammy Taylor), a snooty rich girl.
Kim's grades are poor and her financial situation is precarious, so she decides to start using her body to get what she wants. Kim begins improving her marks when she seduces her history teacher, Mr. Donaldson (John Grant), and then blackmails him into giving her an A, following suit with her other male instructors.
Meanwhile, Kim buys a new car after partnering with Tony (Al Mannino), a sleazy low-level pimp and drug dealer who quickly has her turning tricks all over town.
After establishing herself as a call girl, Kim breaks ties with Tony and starts working with Lance (Garth Howard), a smooth mafia-connected gangster who promises to introducer to a classier clientele. When a customer gets rough with her, Kim stabs him to death with an ice pick, and Lance realizes Kim has what it takes to be a hired killer.
Malibu High was the final directorial credit for veteran director Irvin Berwick.