The Hardy Boys Series
231 books in seriesThe Tower Treasure Summary
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Book 21
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The Clue of the Broken Blade
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Book 22
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The Flickering Torch Mystery
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Book 23
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The Melted Coins
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Book 24
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The Short-Wave Mystery
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Book 25
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The Secret Panel
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Book 26
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The Phantom Freighter
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Book 27
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The Secret of Skull Mountain
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Book 28
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The Sign of the Crooked Arrow
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Book 29
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The Secret of the Lost Tunnel
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Book 30
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The Wailing Siren Mystery
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Book 31
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The Secret of Wildcat Swamp
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Book 32
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The Crisscross Shadow
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Book 33
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The Yellow Feather Mystery
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Book 34
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The Hooded Hawk Mystery
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Book 35
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The Clue in the Embers
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Book 36
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The Secret of Pirates' Hill
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Book 37
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The Ghost at Skeleton Rock
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Book 38
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The Mystery at Devil's Paw
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Book 39
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The Mystery of the Chinese Junk
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Book 40
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Mystery of the Desert Giant
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