Very well-crafted giallo is an obvious precursor to Nicolas Roeg's ingenious and similarly Venetian-set "Don't Look Now". Suspenseful, engrossing and with some skillful visual flourishes--such as the black-veiled killer framed against a snowy landscape--makes it clearly stand from its sleazier counterparts in the genre. Ennio Morricone's delirious score is one of my favorites and nearly impossible to shake from your mind!