The killer's profile, at the conclusion of each case, is used to reason who the is from one of the . While The Death of Rosa Wolf features three killer attributes, The Dockyard Killer features four. All other cases contain a total of five killer attributes. These attributes of the killer are individually discovered from examining evidence, interrogating suspects or receiving analysis reports from lab samples. Such attributes range from everyday habits (like smoking, wearing running shoes or eating fondue) to physical features (like age, weight or blood type) of the killer.