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.
Events over the course of one traumatic night in Paris unfold in reverse-chronological order as the beautiful Alex is brutally raped and beaten by a stranger in an underpass tunnel.
In 1961, Noël is a French soldier in the Algerian war. His comrades, formerly opposed to the war, now oppress civilians, kill and torture. To stay faithful to his pacifist values, he will do something radical.