Two actresses, Béatrice Dalle and Charlotte Gainsbourg, are on a film set telling stories about witches.

Lui, a struggling author with a heart condition, and his wife Elle, a retired psychiatrist, find their idyllic life shattered when Elle begins to succumb to the effects of dementia.

Young dancers gather in a remote and empty school building to rehearse on a cold and wintry night. The all-night celebration soon turns into a hallucinatory nightmare when they learn that their sangria is laced with LSD.