Hardcover, 189 pages
German language
Published Jan. 1, 1997 by Bertelsmann, München.
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The Five find adventure, when they spend Easter vacation at Mr. Lenoir's sinister house Smuggler's Top. Set high above an eerie marsh, the house is honeycombed with hidden staircases and tunnels that once served as a hideaway for smugglers. When strange lights begin to appear, the Five suspect that the tunnels are once more in use.