In 1964, Henri-Georges Clouzot's production of L'Enfer came to a halt. Despite huge expectations, major studio backing and an unlimited budget, after three weeks the production collapsed. This documentary presents Inferno's incredible expressionistic original rushes, screen tests, and on-location footage, whilst also reconstructing Clouzot's original vision, and shedding light on the ill-fated endeavor through interviews, dramatizations of unfilmed scenes, and Clouzot's own notes.

Martinaud, an illustrious notary suspected of being the perpetrator of two horrendous crimes, voluntarily agrees to be questioned by Inspector Gallien on New Year's Eve. What initially is a routine procedure, soon becomes a harsh interrogation that seems to confirm the initial suspicions.