1930s thriller, adapted from a play by Edgar Wallace, starring Wilfrid Lawson and Bernard Lee. To say that Joe Connor (Henry Oscar) and Soapy Marks (Alastair Sim) are embittered following their release from prison would be an understatement. Ten years ago they helped a criminal mastermind known as 'The Terror' pull off a heist - only for his betrayal to rob them of their share of the prize and their freedom. Desperate for revenge the pair head to Monk's Hall Priory in search of The Terror. But with the place said to be haunted by the ghost of a monk, will they discover a different form of terror?