Circus of Fear (German: Das Rätsel des silbernen Dreieck / Mystery of the Silver Triangle), also Scotland Yard auf heißer Spur, also Circus of Terror) is a 1966 Anglo-German international co-production thriller film starring Christopher Lee, Suzy Kendall, Leo Genn and Cecil Parker. The U.S. title was Psycho-Circus. It was based on the novel Again the Three Just Men by Edgar Wallace (1928).