Circus of Fear (German: Das Rätsel des silbernen Dreieck / Mystery of the Silver Triangle); also Scotland Yard auf heißer Spur, also Circus of Terror; US title Psycho-Circus) is a 1966 Anglo-German international co-production thriller film directed by John Llewellyn Moxey and starring Christopher Lee, Suzy Kendall, Leo Genn and Cecil Parker.

When an armoured car is robbed, in a daring daylight raid co-ordinated on Tower Bridge, one of the guards is shot and killed by Mason.

We are introduced to the characters of Barberini's Circus, including Drago, who wears a full mask to hide his fire damaged face.

Heinz Drache, Eddi Arent and Klaus Kinski were regular performers in that series and were added to this production to appeal to German audiences.

[9] The film was bought for AIP who cut the running time to under an hour and released it in the USA as Psycho Circus.

[10] Lee reported that despite his own misgivings about the film "it received more than adequate notices in the trade press (I gave a most ‘sympathetic performance’) and that the public is going to see it in large numbers.

"[11] The Radio Times wrote, "Christopher Lee wears a black woolly hood for nearly all of his scenes in this lame whodunnit, with minor horrific overtones...but the stalwart efforts of the cast including Klaus Kinski and Suzy Kendall act as a welcome safety net for the shaky plot" ;[12] while Britmovie called it "fairly suspenseful.