Hardcover, 186 pages
German language
Published Jan. 1, 1997 by Bertelsmann, München.
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Spook trains in the dead of night! And they seem to vanish into thin air -- but where do they go? The Famous Five are on to it! But discovery of an unusual underground tunnel system, and a secret train-service, has them puzzled. If they follow the tracks, will they solve the mystery?