A murderer is going around killing all the women who seem to have been unfaithful or in one case taking drugs, but the way he kills his victims is very unique, first he injects them with poison which Paralyzes them, then while they are still alive he cuts them up, slowly.
Giancarlo Giannini is great as inspector Tellini, who is asigned to solve this peculiar case. He seems to have more depth to his character than any of the other typical Giallo inspectors. His character doesn't think himself good enough to solve these brutal murders but he is persuaded to continue by his loving wife.
The film is mostly directed well by Paolo Cavara, but some scenes I felt were to typical and easy to predict what was going to happen. The weird music score is by Ennio Morricone and I have to say I wasnt that impressed by it but it is still good enough. The story is well paced and has enough tense moments to keep the viewer intrested.
Overall this is a good Giallo, that isnt quite as good as the best of the genre but it is by far better than the worst.