When director Serge Bromberg found himself stuck in a broken elevator with the widow of the “French Hitchcock,” Henri-Georges Clouzot, he discovered she still had 185 cans of footage from L’Enfer, an unfinished project. Clouzot was given an unlimited budget for his 1964 film, but his insomnia and disasters on set caused the production to shut down after just three weeks. Bromberg’s new documentary unearths the extraordinary experimental footage Clouzot shot during that time, unseen for 40 years, and traces cast and crew to discover the real story of the meltdown behind the scenes.