Death Knocks Twice1969-1h 30min 4.3 / 10 9When private detective Bob Martin looking for a stolen diamond necklace, he also has a clever serial killer on the trail ...DramaThrillerDirected by Harald PhilippWriters Sergio Garrone Mario Di Nardo Sergio GarroneStars Dean Reed Fabio Testi Ini AssmannWATCH TRAILER