The main body of this episode is a somewhat above average crime story for the Adventures of Superman at this stage of the series, balancing serious criminal types with funny henchmen and goofy antics from Lois and Jimmy. What is interesting about the show is the way in which Lois throws Clark Kent off her trail, luring him to her new apartment and then disappearing from that apartment, where the occupant that he finds there denies knowing anything about her.
This is an old device from fiction, often referred to generically as "the vanishing lady," based on an apocryphal story from a 19th century Paris exposition, in which an elderly lady visiting the city checks into a hotel and promptly vanishes, her presence there denied by all of the employees and the other guests -- in that instance, the resolution is that the lady died of plague, and rather than risk shuttering the exposition, her presence there was covered up. It was used, to other purposes, by Alfred Hitchcock as the central premise of The Lady Vanishes, and turns up in countless television shows, ranging from The Big Valley ("The Disappearance") to The Rockford Files ("Sleight of Hand," one of the grimmest shows in the series), and in the movie Dangerous Crossing (1953), among many others.