This enthralling documentary on a film that was never completed began with a chance encounter. A few years ago, co-director Serge Bromberg, a film archivist and restoration specialist, was in a stalled elevator with the widow of legendary filmmaker Henri-Georges Clouzot, best known for the masterpieces The Wages of Fear (1953) and Diabolique (1955). Through this meeting, Bromberg gained access to the 15 hours of footage from Inferno, a movie that Clouzot abandoned in 1964. “Inferno,” we learn, takes on a double meaning: Clouzot and his cast and crew were completely in hell. The lead actor in Clouzot’s film, about a husband driven mad by jealousy, eventually walked off the set, fed up with the director’s obsessive controlling; shortly thereafter, Clouzot, who had become overwhelmed by the project, suffered a heart attack. Filled with endlessly fascinating anecdotes from surviving cast and crew, including the actress Catherine Allégret and the filmmaker Costa-Gavras (who was an assistant director on Clouzot’s movie), Henri-Georges Clouzot’s Inferno is also a testament to the stunning look of this film-that-never-was. The footage from Inferno reveals Clouzot’s experimentation with Op Art designs and psychedelic color schemes—which only further emphasized the bewitching beauty of the film’s then-26-year-old star, Romy Schneider.