It was part of a very successful series of German films based on the writings of Edgar Wallace and adapted from the 1925 novel titled The Ringer (originally: The Gaunt Stranger).
The film was adapted from the 1925 novel by Edgar Wallace titled The Ringer (originally: The Gaunt Stranger).
[1] An earlier German version had been made in the Weimar Republic in 1932, also called Der Hexer.
Shooting took place from 3 June to 10 July 1964 on location in Hamburg and at the Spandau Studios in Berlin.
[1] The FSK gave the film a rating of 16 and up and found it not appropriate for screenings on public holidays.