What Is This Evil That Shadows Their Lives? Experiment Perilous was directed by Jacques Tourneur and features a screenplay by Warren Duff based on Margaret Carpenter’s novel of the same name. The film stars Hedy Lamarr, George Brent, Paul Lukas, Albert Dekker, Olive Blakeney, and Carl Esmond; Roy Webb composed the music and Tony Gaudio handled the cinematography. The story takes place in 1903 New York, where ps…