Back in the pre-DVD era (yes some of us are old enough to remember it), "4 Flies On Grey Velvet" was Dario Argento's hardest-to-find giallo (though not film in general - that was, and still is, "Five Days in Milan"). After becoming more widely-available, most people must have felt underwhelmed upon finally seeing it. Despite occasional injections of style, and offbeat supporting characters like an openly gay private investigator with a 0-84 success rate and Bud Spencer as no less than God, it's too long and too tediously paced; the killer is very easy to spot (in fact, it can only be this one person - there are no possible alternatives). But Argento does save the best for last - the final sequence is almost worth sitting through the whole film for. **1/2 out of 4.