Jason Dark is a fictional character created by German author Helmut Rellergerd in the 1970s. He is known as a detective who specializes in supernatural cases, often encountering ghosts, monsters, and other paranormal phenomena. Dark is the protagonist of the John Sinclair series, which has gained popularity in Germany and beyond. The John Sinclair series features a mix of horror and detective fiction, with Jason Dark solving mysteries that involve the occult. The stories are set in various locations, often highlighting the eerie and mysterious aspects of the supernatural world. Dark's character embodies the classic detective archetype, combining intelligence with bravery.