Thanks to his classical masterpiece *M*, made in 1931, German director Fritz Lang was often referenced as one of the first filmmakers to use the now‑very‑popular motif of serial killers. A quarter of a century later, during his final years in Hollywood, Lang also used that motif, but in a somewhat unusual genre context. *While the City Sleeps*, his 1956 film, deals with the phenomenon of a psychopathic serial killer…