What happens
Superman searches for Pug Flanagan after the boy is discovered missing from a Panama hotel, along with a treasure map he had taken from Clark Kent's room. Kent, Jimmy Olsen and Pug are staying in the hotel while bound for Metropolis, and the search draws them into the harbor. Jimmy finds Pug bound and gagged in a storage bin, and the two learn that a man is slipping away on a fishing boat. The episode is the second part of The Nitrate Shipment, from the Adventures of Superman radio series, first aired on April 23, 1941.
A hotel in Panama and the nearby harbor waterfront, at night
Characters: Clark Kent, Jimmy Olsen, Pug Flanagan, Superman, Carlos, Manuel, Sanchez
Listen for: Jimmy Olsen discovering Pug Flanagan bound in the storage bin, and the boys sneaking aboard the La Paloma
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.