The Sadist
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The Sadist (German: "Der Sadist") is the book published by psychiatrist Karl Berg, following the confessions of Peter Kürten, a well-known serial murderer in the late 1920s in Germany.
The book was originally written in German but has been available in English since 1997.
The film by Fritz Lang M is based on the story of this mass murderer.
The Sadist is also the name of a 1963 cult film written and directed by James Landis.