#20 Mystery of the Flying Express

• A Mysterious Guest


• The New Detective


• The Strange Professor


• A Familiar Face


• The Odd Code


• The Disguise


• The Hidden Safe


• The Flying Express


• Joe Disappears


• Footprints


• The Clue in the Ashes


• A Daring Rescue


• A Fight on the Plains


• The Secret Plan


• Muffled Voices


• Followed!


• An Accident


• The Train Wreck


• Trailing the Suspect


• The Carved Symbol


• A Big Discovery


• A Narrow Escape


• The Spy Camp


• Closing the Case

 

Cover Art: Paul Laune

Cover Design:

Interior Illustrator:

Author:

First Copyright: 1941

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