Death Knocks Twice
When private detective Bob Martin looking for a stolen diamond necklace, he also has a clever serial killer on the trail ...
Cast: Dean Reed, Fabio Testi, Ini Assmann, Leon Askin, Werner Peters, Riccardo Garrone, Mario Brega, Hélène Chanel, Femi Benussi, Renato Baldini, Teodoro Corrà , Lanfranco Cobianchi, Tom Felleghy
Crew: Harald Philipp (Director), Claudio Racca (Director of Photography), Alfred Srp (Editor), Max Pierre Schaeffer (Story), Mario Di Nardo (Screenplay)