Blood and Black Lace (1964) dir. Mario Bava; starring Cameron Mitchell, Eva Bartok
Nasty little movie, which I don't entirely mean as an insult. Begins with the killing of a model as she approaches the fashion house she works for, her murder stemming from earlier nefarious events like murder and blackmail. There's a diary that leads to more murders, and finally the revelation of who's behind it all. My take away is that Bava or his cinematographer must have loved his color palette. Scenes are drenched in colors, mostly red, green, purple, some white and some brown. The killer appears wearing a black hat and coat (though late in the movie they look more of a dark blue) with a white mask, which makes the other colors pop more. Note that scenes with the police are more sedately colored, Bava apparently contrasting the mundane with the more Baroque and Gothic.
Oh, and at least three male voices in the movie sound like they were dubbed by Paul Frees ... and IMDB confirms it. Oddly, they don't include Mitchell's character, but Mitchell's voice didn't sound like I remember it from his days on the tv show, The High Chaparral.