This is the fourth in the "Humphrey-Skinner Frog" suspense mystery novel series following 'Leopard Frog', 'Diamond Frog' and 'Tiger Frog'. It features Burton Humphrey, retired Chief Inspector of Scotland Yard and his brilliant research investigator, Penelope Skinner. Two quite unsuspecting elderly Jewish tourists find themselves in London to visit for the final time the place that held safety and the promise for a new life far away from the horrors of the concentration camp of Auschwitz. With a twist of fate that collided with a terrible coincidence, they face one of their most brutal captors from the darkest times in their lives. This chance meeting will create a chain reaction of murder and deceit as a forty-year old carefully orchestrated plan, developed by Odessa to allow Nazi war criminals to live the remainder of their lives without fear of facing justice for their war crimes, is in danger of being exposed. Humphrey and Skinner begin to unravel several secret identities and place their actions into public review. Soon they realize that their investigation includes individuals highly placed within both the Catholic Church and Britain's Parliament. Burton soon learns the Nazi war criminals he is pursuing are just as dangerous and brutal with the planning of his death as they were with their systematic disposal of millions of Jewish prisoners during the Holocaust. He is further frustrated to learn the head of the group, under English law, is completely untouchable and will not face justice for his actions. His guilt is obvious but he will never be forced to divulge his evil secrets regarding the single greatest atrocity in the history of mankind.