Teleplay of the BBC radio episode, 01/1969.Printed in the collection .
Mr. Calder is undercover at a boarding school, playing the part of a teacher, while trying to determine if one of the other teachers is really Dr. Konrad Fleischmann, aka the Nazi Angel of Death who was the director of Hitler's extermination program. Meanwhile, Mr. Behrens is looking into Fleischmann's life before the War started.