What happens
Clark Kent and Jimmy Olsen, returning by train from a vacation, become curious about a nervous, gray-haired man across the aisle, whose newspaper photo identifies him as Dr. Robling, the inventor of a new communications device. When Kent tries to interview him, the man denies his name and hurries away, leaving behind a crumpled note reading "this is your last warning." Later, the man is found collapsed in the dining car, and his daughter takes him to their drawing room. When Kent returns to check on them, the room cannot be reached and the conductor's passenger list shows different occupants. This is the first part of the Superman adventure.
A fast express train travelling at night, including the club car, dining car and sleeping car drawing rooms.
Characters: Clark Kent, Jimmy Olsen, Dr. Robling, Miss Robling, Conductor
Listen for: The strange warning note, Dr. Robling's denial of his name, and the mystery of the drawing room listed to Mr. and Mrs. Jack Smith.
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.