Twins Cece and Devin Brewer are sent to spend a summer in Gravesend, Brooklyn, with their divorced dad. A threat is stirring, and they quickly realize that dark secrets are among them, triggering a chain of events that unravel a profound mystery. As they delve into the unknown, Cece, Devin and their friends — Alex, CJ and Frankie — find themselves entangled in the chilling tale of four teenagers who mysteriously vanished in 1994.

A group of five high schoolers embark on a shadowy and twisted journey to investigate the tragic passing three decades earlier of a teen named Harold Biddle – while also unearthing dark secrets from their parents' past.