Squeaky-voiced Dorothy (Nolan) really has a mad on at ordinary girl Helen (Hackett). She thinks Helen ruined her wedding engagement to the the girl's brother. Now Dorothy makes threatening calls to harass poor Helen. Sick of the annoyance, Helen finally hires attorney Blackshear (McCarthy) to go after the stubborn Dorothy. Naturally, being Hitchcock, not everything is exactly as it appears.
In my view, it's an uneven entry that would have worked better in the 30-minute format. Too many scenes at the photographer's, for example, smack of padding, while McCarthy's largely wasted in a routine role. Then too, the climactic sequence would have more impact if it didn't linger well beyond its reveal. Nonetheless, the story's a chance for the star-crossed Joan Hackett to show her acting chops, which she does. Plus, special effects gets a workout setting up the baroque flashback, which is quite unusual for TV of the time. But then that's why many of us catch these entries, since we can always expect the unexpected.