Clearly his parents had aspirations for their son "Marcus Aurelius" when they christened him, but sadly "Mark" (John Hubbard) has progressed little beyond a job as a bank clerk. His life is about to liven up though when he returns from holiday to find he is amidst a killing spree - and the photofits suggest the culprit is the spitting image of himself. Investigators duly arrive and when he fails to prove a conclusive alibi, it looks like "Det. Dolan" (Cy Kendall) has concluded that "Mark" is going to be toast! Now he has to ally himself with the practically-minded "Brook" (Rita Quigley) and try...