This is a TV fiction that was shown in the Italian channel Rai 1 in 1973. It is set in Milano, where a series of homicides happen along the navigli. I saw this fiction when I was 7, and did not understand much - but I remember enough to say it was very well filmed and constructed. A real thriller. And the acting was good for the kind of product. They used to do better fiction thirty years ago... I would love to see it again. Unfortunately it seems nobody has it any longer. Rai probably still has it in its archives, but they allow access only to stuff that is not too old, unfortunately. Let me know if you do have a copy or if you know how i could get one Cheers, Tommaso