Under the cover of darkness and a violent storm, electrical engineer Sidney Cassell thought he'd committed the perfect murder. But immediately after pushing his rival to his death from atop a pylon, he himself is struck by a live high-voltage cable. Cassell survives the accident, only to discover that the electrical shock has affected his body, causing him to glow with a strange inner light. Soon he becomes sucked into a vortex of murders and treachery, hunted by the police and unscrupulous scientists seeking the secret of his weird affliction.