Henri Verdier, a young bank manager, has made the acquaintance of Karine, a model of great beauty. Robert, who claims to be Karine's brother, forces Karine to introduce him to Verdier. This is to offer him an urgent business deal: 50 million for a uranium purchase which, within a few days, should yield double that amount. Blinded by passion, Verdier accepts and "withdraws" the necessary sum from his bank. He soon realizes he's been duped. Karine is not Robert's sister and Robert is a crook. Verdier tracks them down.

In a mysterious French castle dark meetings and apparitions happen, seasoned by nauseating erotic menages. The involvement frantically increases up to the amazing epilogue.

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.