 Freda met with Italian producer Oreste Coltellacci who set up a deal with the German company Rialto who created several work in the German subgenre called the "krimi".The "krimis" were inspired by the works of Edgar Wallace and had been popular since Harald Reinl's film "Der Frosch mit der Maske" (1959) In Germany, the film was promoted as being based on "Das Gesicht im Dunkeln" by Edgar Wallace.This was done for commercial reasons as the script had nothing to do with the book.