For some reason the synopsis of this movie on many cites and some of the reviews is wrong talking about things like mechanical monsters to kill people with Type O blood. It's like they write the review from the synopsis and haven't seen the movie or can't remember it. The movie is about Interpol recruiting a retired spy to investigate crimes committed by strange dark skinned men and women. The plot thickens as he learns these crimes are committed by kidnapped men and women with Rhesis Zero blood (Neither - or +) who have been turned into Robots. The movie is slow at times but has it's good points. Overall I enjoy it and have seen it many times. Most of the prints out there are washed out and edited, but Gaumont in France sells a pristine copy (in French with subtitles called Cartes Sur Table the original French name. I have a copy of that one as well as older copies. The film was supposedly shot in color and released in B&W, I would like to see the color version.
Review of Cartes sur table
