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Lennon Grant returns to Hawaii after her freshman year of college and learns someone has uncovered the terrible secret she and her friends swore to keep last summer.

Despite being fractured by the secret, the former friends reunite to try and figure out who else might know what they did.

Any doubt about the connection to last summer erased, the friends can't go to the authorities without revealing their secret.

The killer continues to taunt the friends with tantalising clues, while the traumatic history of Wai Huna and a religious cult resurfaces.

The chief of police questions everyone in town with any connection to the mounting murders, while the reunited friends think they finally know the identity of the killer.