In Montreal, Canada, scientist Andre Delambre (Saint David Hedison) is establish dead with his caput and arm oppress in a hydraulic imperativeness. Although his married woman Helene (Patricia Jesse Owens) confess to the offense, she refuse to supply a motivation, and get down act queerly. In peculiar, she is haunt with flies, include a purportedly white-headed fly. Andre’s blood brother, Francois (Vincent monetary value), lie and state he catch the white-headed fly, and, think he know the truth, Helene explain the fortune surround Andre’s decease.