The Sadist () is a book published by psychiatrist Karl Berg, following the confessions of Peter Kürten, a notorious German serial killer known as both The Vampire of Düsseldorf and the Düsseldorf Monster who committed a series of assaults and murders, primarily between 1929 and 1930.Monsters of Weimar p. 194

The book was originally written in German. The first English edition was issued in 1938, by Acorn Press. A second edition was published by William Heinemann Medical Books in 1945.

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