The mid-70's: a timid young New Yorker leads an uneventful life until he is fatefully exposed to the pulsating rhythms of a brand-new genre of music: disco. Unable to control his murderous impulses that stem from a traumatic child...

To celebrate their graduation, the teenagers from Valley Hills High School have organized an '80s-themed party in an old water park. Things grow gruesome when it turns out that a mysterious maniac has inserted giant razor blades into the water slides. The Wet Valley water park thus becomes the backdrop for a bloodbath (literally), and everyone is a suspect.