For the first time in Rialto's Edgar Wallace series, this black-and-white film featured colored opening credits with blood-red letters on a b/w background. This tradition was kept in the future with many different colors used. Until the late '90s, the colored opening credits were always shown in black and white on German television and were sometimes unreadable.
The first Edgar Wallace film directed by Alfred Vohrer. Until 1968, he would direct 13 more and became the most prolific director of the series.
The huge former professional wrestler Ady Berber made an impressive and truly frightening villain as "Blind Jack". He would be cast in frightening roles in later German krimi films. Like many great movie villains, off camera, he was known to be a very friendly man.
In the early days of production, Harald Reinl was attached to direct but when shooting was advanced, he was still busy with the production of The Return of Dr. Mabuse (1961) and producer Horst Wendlandt offered the job to his friend Alfred Vohrer.
This 1961 German krimi was not released in the United States until 1965 when it was acquired by Magna Pictures and released in an English dubbed version on the bottom of a pre-packaged double feature with an Italian horror film, Riccardo Freda's "The Ghost" (1963).