Mario Bava's Blood and Black Lace (1964) is one of the earliest examples of both Italian giallo films and the so-called "slasher" genre. Giallo is Italian for "yellow," which originated from paperback crime novels identified by yellow covers. The Italian films labeled as such were most often thrillers or horror films, or as we Americans may call them, slashers. While many films -- such as John Carpenter's Halloween (1978) or another Bava effort Bay of Blood (aka Twitch of the Death Nerve) (1971) -- may have influenced or inspired early slasher films, Sean S. Cunningham's Friday the 13th (1980) is generally considered the movie which sparked a run of slasher films in the early to mid-80s (Wes Craven's Scream generated a similar result in 1996). Slasher films are primarily categorized by a systematic killing of characters, and it is these individual murder sequences which provide the true focal point for the films.
In spite of the multitude of characters, Bava does a splendid job of keeping them all in check. Names are given (quite directly sometimes, when the police have suspects lined up), and the director spotlights particular characters at the appropriate times. Best of all, Bava does not overstep his directorial bounds and make the viewers feel as if he is drilling the information into their collective heads. It's an impressive feat, especially back in 1964, when gialli and slasher movies were not common genres and had no real format.
Before becoming a director, Mario Bava was a cinematographer, and this is abundantly clear in Blood and Black Lace. Even the most inferior DVD or VHS transfer cannot spoil the rich, gorgeous colors of Bava's films. So many scenes include bright greens, blues and reds, sometimes as strange lights inexplicably flashing, creating a surreal, hypnotic experience. Like many Italian films, the movie suffers a little from second-rate English dubbing (even though it was actually filmed in English), but Eva Bartok as Christina -- owner of the fashion house -- is terrific and easily steals the movie. Bava's son, Lamberto Bava, worked as an assistant director on his father's films before directing his own, such as his own giallo, A Blade in the Dark (1983).