Martin (George Baker) is heading home when he spies a young woman running in her underwear. Naturally he stops to help her. He falls in love with Patricia (Carole Gray) and marries her after a quick romance, even though she is on the run from a psychiatric hospital!
Martin brings Patricia home to meet his father Henri (Brian Donlevy) who is conducting mysterious experiments involving teleportation, why Henri is the son of the man who became The Fly...
There are no flies in this film but there are hideous mutants, the results of teleportation experiments gone wrong, and kept in the stables. Henri's servants Tai (Burt Kwouk) and Wan (Yvette Rees) are also rather odd, especially Wan who takes a dislike to Patricia and tries to drive her insane. Soon the poor girl is recoiling in terror from the dark secrets of her father-in-law's house...
This is a fine film, marred only by the low budget which is felt sometimes in the effects. The film has a real feeling of doom and menace and plenty of twists, including the final deadly one.
