When Jean Cocteau enlisted Jean-Pierre Melville to adapt Cocteau’s novel about incestuous siblings, he hoped Melville would drop dead so he could take over. Thankfully, that didn’t happen. In Les Enfants Terribles, Melville checks Cocteau’s preciousness with pre-New Wave vigor. Dermithe is appropriately handsome, but Stéphane, as his femme-fatale sister, tears through this mesmerizing tale of l’amour fou with stunning ferocity. EXTRAS A booklet of interviews with Stéphane and Melville is more useful than critic Gilbert Adair’s spotty commentary.