A police investigator in 1930s Berlin, Lohmann first appears in M as the lead detective in the search for a serial killer of children. A keen observer of humanity, he's able to spot the small details others might miss, and affects a bumbling facade to mask his investigatory prowess. He uses these abilities to track down the killer. He loves Wagner operas and is a heavy smoker. The character of Lohmann is probably based on the famous criminologist Ernst Gennat .