Ernst Fritz Fürbringer

Both Scotland Yard and an amateur American sleuth are tracking a master criminal known as The Frog. This moniker refers to the bulging-eyed mask worn by the evildoer, and is reflected by the frog icons painfully tatooed onto the forearms of his henchmen. The trail leads to the country manor of an enigmatic, steely-eyed nabob, whose repressed son has eyes ...

Hamburg, Germany, 1944, during World War II. A serial killer terrorizes the city. When it seems clear that the local police are unable to catch him, forces as dark and terrible as the criminal himself become involved in the case.