Brian De Palma’s darkly comic, hall-of-mirrors thriller stars a deliciously deranged John Lithgow in a diabolical double role: as a mild-mannered child psychiatrist and his evil twin brother, who both take to kidnapping and murder in order to procure toddlers for a bizarre psychological study. Out-of-left-field plot twists, electrifying set pieces, and Hitchcockian doubles (and triples and quadruples) abound, while the film’s labyrinthine plot and disorienting, dreamlike tone are enhanced by the intricate, maze-like Steadicam shots.