A group of college students plan one final pre-graduation party at a secluded lake house for an "80s murder mystery" weekend unaware that a crazed, masked killer has decided to join the celebration. Will anyone survive the slaughter - or is this going to become a truly cruel summer?

Heeding the advice of medical professionals, the traumatized survivors of a deadly vacation house massacre try to confront their own personal demons by organizing a stage production of their harrowing experience. But a familiar face is back for revenge - and determined to make sure these unsuspecting actors fade to black before their time.

Survivors of the bloody "theatre massacre" years earlier must fight for their lives as members of their psychiatric hospital's therapy support group begin falling prey to an unseen psychopath. Deep secrets are uncovered and old friendships are tested as they realize the killer may actually be much closer to them than they ever thought possible.

When a severed human hand is found at a weekend film festival, the actual cast and crew of the CRUEL SUMMER trilogy suddenly find themselves thrown into the middle of a real-life sequel engineered by an unhinged psychopath.