During a hike of the countryside, the Hardy boys and their pals learn that an abandoned mill has recently gotten new owners. When the boys go to look, the new owners claim to be producing a new breakfast food, field a few questions, and then shoo the boys away. But that's enough to make the Hardy boys suspicious. Are the men to be trusted? Are they merely surly scientists, or are they covering up a darker secret?

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This is the third book of the Hardy boys series, first published in 1927. It was rewritten in 1962; this Standard Ebook contains the original 1927 text.

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Perfect for young readers who love classic mystery adventures and timeless detective stories! This thrilling third installment in the beloved Hardy Boys series delivers all the suspense, clever sleuthing, and brotherly teamwork that has captivated generations of mystery fans. Join Frank and Joe Hardy as they uncover a dangerous counterfeiting operation hidden behind the innocent facade of an old mill!

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The Secret of the Old Mill

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