A hooded serial killer finds a novel way to murder his victims--he lashes them to death with a whip. The police try to track him down before any more murders occur.
The Sinister Monk is a 1965 West German thriller film directed by Harald Reinl and starring Karin Dor, Harald Leipnitz and Siegfried Lowitz. It is based on the 1927 play The Terror by Edgar Wallace and was part of a very successful series of German films inspired by his works.