Early 1919: WWI is over, misery and poverty dominate Berlin. A perfect breeding ground for crimes of all kinds. The two-part documentary paints a picture of a deeply divided society in times of radical change. During the early years of the Weimar Republic, two mass murderers terrorized the capital. One of them targeted young lovers, the other was given the nickname 'the Beast of Berlin' and preyed on women. It took the police years to identify and convict the perpetrators. Ernst Gennat, head of the criminal police, pioneered new methods of systematic forensic investigation and profiling, making his division one of the world's leading homicide squads. The two-part documentary uses criminal cases to paint a picture of Berlin during the Weimar Republic, reconstructing events with the help of documentary photographs from 1918 to 1933, interviews with experts and case files.