While it isn’t the first of the Giallo subgenre, Blood and Black Lace is my early favorite. This was the film that influenced all of the black glove killer films to follow. The villain’s costume alone was imitated so often it’s ridiculous. Check out Bava’s use of unnatural colored lighting. You will notice similar effects in many other filmmaker’s work still to this day. To top it off, Arrow’s restoration is flat-out stunning (the streaming version is the same re-master).