A fine actress Sandy Robinson (who unfortunately never made a career of acting per only 2 minor credits in IMDb) is featured in this unusual episode, sort of a Girl Who Cried Wolf story from Stirlling Silliphant.
She's fresh to New York City and has her phone installed, with a first caller dialing for the previous holder of that number, and she overhears what sounds like a woman being murdered. The cops, including our heroes, don't have enough to go on, so she decides to pursue the mystery herself. She gets a big break when a newspaper reporter is interested in her story, and publicizing the matter she works on raising a $500 reward for further information.
The killer shows up and as a lonely girl in the Big City with no friends, she's easily taken in by him, starting with a photogenic first date ice skating at the seasonal Rockefeller Plaza rink. He shows her other sites, but Silliphant introduces a quite macabre twist: he works with the city's Sanitation Department and takes her to an imposing place where trash is taken to be incinerated -where he disposed of the first victim's body.
Sandy is a fine damsel in distress in the final reel, with Frandiscus arriving in the nick of time to capture the murderer. Most interesting element of this episode is the prologue montage where Silliphant paints a bleak capsule portrait of what women do for a living in NYC (circa 1958): a sketch artist for a department store, pushing a baby carriage as a housewife, or a dull office job (like Sandy has) watching the clock yearning for quitting time to come. It's a quite bleak assessment, before Betty Friedan and Gloria Steinem began to change things for the better.