When 14-year-old Ellen Coleman vanishes without a trace from their quiet coastal town, her twin brother Nick is left reeling. The police suspect a runaway, but Nick knows Ellen would never leave him behind. Armed with only her cryptic journal entries and a growing sense that something sinister lurks beneath their town’s idyllic surface, Nick begins his own investigation. As he uncovers secrets Ellen kept hidden—even from him—Nick must confront the possibility that the sister he thought he knew may have been in danger long before she disappeared. With time running out and trust unraveling, Nick races to find Ellen before the echoes of her absence become permanent.