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First published in 1927, The Hardy Boys series follows brothers Frank and Joe Hardy's daring adventures. The series began with The Tower Treasure and has expanded to over 200 books.

The Hardy Boys Starter Set
The Tower Treasure (Hardy Boys Series #1)
The Shore Road Mystery (Hardy Boys Series #6)
The Secret of the Caves (Hardy Boys Series #7)
The Mystery of Cabin Island (Hardy Boys Series #8)
The Great Airport Mystery (Hardy Boys Series #9)
The House on the Cliff (Hardy Boys Series #2)
The Secret of the Old Mill (Hardy Boys Series #3)
Hunting for Hidden Gold (Hardy Boys Series #5)
What Happened at Midnight (Hardy Boys Series #10)
While the Clock Ticked (Hardy Boys Series #11)
The Missing Chums (Hardy Boys Series #4)
The Yellow Feather Mystery (Hardy Boys Series #33)
The Crisscross Shadow (Hardy Boys Series #32)
The Ghost at Skeleton Rock (Hardy Boys Series #37)

All Books

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The Tower Treasure (Hardy Boys Series #1)
The House on the Cliff (Hardy Boys Series #2)
The Secret of the Old Mill (Hardy Boys Series #3)
The Missing Chums (Hardy Boys Series #4)
Hunting for Hidden Gold (Hardy Boys Series #5)
The Shore Road Mystery (Hardy Boys Series #6)
The Secret of the Caves (Hardy Boys Series #7)
The Mystery of Cabin Island (Hardy Boys Series #8)
The Great Airport Mystery (Hardy Boys Series #9)
What Happened at Midnight (Hardy Boys Series #10)
While the Clock Ticked (Hardy Boys Series #11)
Footprints Under the Window (Hardy Boys Series #12)
The Mark on the Door (Hardy Boys Series #13)
The Hidden Harbor Mystery (Hardy Boys Series #14)
The Sinister Signpost (Hardy Boys Series #15)