It was supposed to be the perfect night for a party. But after an explosive fight with her ex-boyfriend, twenty-one-year-old social media star Chelsea Dawson vanished into the beautiful summer night at the Jersey Shore without a trace. When amateur sleuths Seneca, Maddox, Aerin, and Madison hear about the suspected kidnapping, they immediately notice a chilling detail: the victim looks exactly like Aerin's sister, Helena, who was murdered five years earlier. Seneca is absolutely convinced she knows who killed Helena, and she cannot shake the terrifying feeling that the exact same person has taken Chelsea. Desperate for answers about the two girls, and the hidden truth behind her own mother's murder, Seneca will stop at nothing to prove the cases are linked. When Maddox receives a mysterious invitation to the Shore from their primary suspect, the team dives headfirst into an intense, dangerous new investigation. Full of disturbing secrets, startling twists, and horrifying revelations, this gripping thriller follows the Amateurs down a twisted path crafted by a brilliant killer.