A motorist picks up to escaped convicts. Instead of turning them over to the police he hires them to kill his wife.

Army radiation experiments awaken a subterranean monster from a fissure that feeds on energy and proceeds to terrorise a remote Scottish village. An American research scientist at a nearby nuclear plant joins with a British investigator to discover why the victims were radioactively burned and why, shortly thereafter, a series of radiation-related incidents are occurring in an ever-growing straight line away from the fissure.

A gang of thieves led by American Eddy (Reed de Rouen) kill a security guard during a botched safe robbery and flee with his daughter (Leigh Madison) as a hostage. They hide out in a dangerously unstable old warehouse for a couple of days awaiting their getaway ship to sail, but Johnny (Kenneth Cope) falls for the girl - provoking a serious falling-out and a violent conclusion to the disastrous heist.

The wife of a night club owner frames an American writer for his murder.