Red Jack is back! London is gripped by terror as murder most foul is committed night after night. The culprit strikes as if invisible, leaving only the mutilated remains of his victims to show his passing. Scotland Yard is baffled and in desperation, calls in an American husband and wife team of detectives to solve the case of "Jack the Ripper." As the death toll mounts, the eccentric Americans discover a series of grisly clues leading into the highest reaches of British society - including the Royal Family!