This episode is an uncredited remake of a much better episode of a much better-remembered (and just plain better!) Quinn Martin series - "The Streets Of San Francisco"'s "The Most Deadly Species" with a gangster wanting revenge for a killing and calling in a professional assassin called Sydney. This being the 1970s., no one would expect a professional killer to be A WOMAN!!! She moves in above Keller/Charlie to spy on him and track down her target. This version is more blatant about it, with the killer referred to as the Angel (as shown by the title of "Ms. Murder"- This telling of the tale is hampered by Shelley Novack and Jennifer Warren's lack of chemistry (though Michael Douglas and Brenda Vaccaro were dating at the time). Incredibly meh.
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