A group of teens breaks into school after hours for a senior prank, only for the night to turn sinister when one of them turns up dead—and the rest are locked inside with the killer—in this edge-of-your-seat young adult thriller perfect for fans of Holly Jackson and Karen M. McManus.

Graduation at Bloomfield Academy is almost here, but golden boy Mason is not leaving without a killer senior prank. Lucy, his type A girlfriend, is only coming because he begged. Brainiacs Alex and Brady are there to problem-solve. Theater star Kenzie is thrilled they’re including her…finally. And troublemaker Ian? Well, nobody invited him, but that’s never stopped him before. All it takes is one night. One epic prank. The plan is going perfectly until…one of them is found dead at the foot of the stairs. And it looks a lot like murder.

When the school’s cutting-edge security system locks them inside, they realize there’s no way out and no one coming to save them. Trapped with a killer, their suspicions grow—everyone has a motive and secrets to hide. As the night creeps forward, paranoia rises, and it’s clear that the survivors must use their wits to make it until dawn. But as their hidden truths claw their way to the surface, a terrifying question looms: What if the killer is one of them?