Mystery of the Whale Tattoo
Helping in a case their father is working on, the Hardy brothers try to find an informer who has telephoned from a booth in their home town, and are hired by a carnival owner to spot pickpockets.
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What to read after Mystery of the Whale Tattoo
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The Secret of the Old Mill
The Crisscross Shadow
Hunting for Hidden Gold
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DEAD ON TARGET (HB #1)