When a robbery at a racetrack goes wrong ex-con Johnny Bannion is caught and sent back to prison. He won't tell the rest of the gang where he has stashed the loot leading to violent consequences.
A writer of murder mysteries finds himself caught up in a string of murders in London.
Routine tests on a traffic accident victim lead to shocking discoveries when the man's blood is found to be unidentifiable and x-rays reveal a disc embedded in his brain. His fabulous tale of being an escaped prisoner from an alien spaceship takes a turn for the sinister when the hospital staff realise that they're under a state of siege...
