Token cinema Nazi, Anton Diffring, plays a potty plastic surgeon called Doctor Rossiter who has to do a runner after cocking-up an operation on a young woman, leaving her horribly disfigured. He absconds to France (a good choice of country if you don't want anyone to follow you) and comes across a circus that is owned and run by a man called Vanet (Donald Pleasence). When the circus owner meets with an unfortunate "accident", Rossiter takes over the circus and uses it as a front to continue his dodgy surgical practices.
This is an entertaining horror film from 1960 (not to be confused with the similarly-titled "Circus Of Fear") with a fine cast that also includes Yvonne Monlaur (from Hammer's "The Brides Of Dracula"), Yvonne Romain (from Hammer's "The Curse Of The Werewolf") and Kenneth Griffith ("The Wild Geese" and "Four Weddings And A Funeral"). It was directed by Sidney Hayers, who also directed the classic 1960s witchcraft thriller "Night Of The Eagle" (a.k.a. "Burn, Witch, Burn") and some episodes of many famous tv shows including "The New Avengers", "The Professionals", "Battlestar Gallactica", "The Fall Guy", "Magnum P.I.", "Knight Rider" and "The A Team".
I have memories of watching this film on television many years ago and I thought that it was quite gruesome and shocking at the time. Now it seems pretty tame by modern horror film standards but the action moves along quite well and there are still a few moments of shock and suspense.
Despite some of the cast members, this is not a Hammer horror film but if you like Hammer films and other British horror films from this period then you will probably enjoy "Circus Of Horrors".