Death Knocks Twice These "girls" are tough! When private detective Bob Martin looking for a stolen diamond necklace, he also has a clever serial killer on the trail ... Details Casts Galleries Posters Title Death Knocks Twice Release Date 1969-11-25 Runtime 01 Hours 30 Minutes Genres Drama Thriller Production Companies Maris Film, Produzioni Atlas Consorziate Production Countries Germany, Italy Dean Reed... Bob Martin... Fabio Testi... Francesco di Villaverde... Ini Assmann... Ellen Kent... Leon Askin... Peppe Mangano... Werner Peters... Charly Hollmann... Riccardo Garrone... Armando Locatelli... Mario Brega... Riccardo... Hélène Chanel... Angela... Femi Benussi... Lois Simmons... Renato Baldini... Lionel Simmons... Teodoro Corrà... Rinaldo... Lanfranco Cobianchi... ... Tom Felleghy... Berry... Nadja Tiller... Maria di Villaverde... Anita Ekberg... Sophia Ferretti... Adolfo Celi... "der Professor"... Marlies Petersen... Babsie... Bruno Ariè... Charly's Henchman... Antonietta Fiorito... (credit only)... Original Size (1280x720) Original Size (780x1170) Original Size (960x1440) Original Size (2000x3000) Original Size (640x960) Original Size (500x750) Original Size (550x787)