What happens
Superman, disguised as reporter Clark Kent, searches the city at night for Sidney Reichroft, a British explorer who has been abducted from her hotel. Reichroft, who broke the seal of the tomb of Osiris in Egypt, is held by men demanding the secret black pearl of Osiris, which she insists she does not have. Clark Kent discovers Reichroft's captors at a hideout, and Tumbleweed Jones joins the rescue. The episode is the fourth part of the Adventures of Superman serial and originally aired on January 22, 1941.
Night-time city and a hotel in an unnamed American city, with a hideout on Water Street and a hospital
Characters: Superman, Clark Kent, Jimmy Olsen, Sidney Reichroft, Tumbleweed Jones
Listen for: Reichroft's captors demanding the black pearl of Osiris, and Superman overhearing them through a skylight
Written from the episode itself; it never gives away the ending. Every recording is remastered for the stream: cleaned of rumble, hiss and mains hum (and the old TV whine where we found it), then levelled in two passes to steady broadcast loudness, so one show is never quieter than the next.