When a dance troupe is lured to an empty school, a bowl of drug-laced sangria causes their jubilant rehearsal to descend into a dark and explosive nightmare as they try to survive the night—and find who's responsible—before it's too late. French dancers gather in a remote, empty school building to rehearse on a wintry night. The all-night celebration morphs into a hallucinatory nightmare when they learn their sangria is laced with LSD.