651 books • 49 series
The Secret of the Caves #7 (Hardy Boys, #7)
The Mystery of Cabin Island #8 (Hardy Boys, #8)
The Shore Road Mystery #6 (Hardy Boys, #6)
Hunting for Hidden Gold #5 (Hardy Boys, #5)
A Con Artist in Paris (Hardy Boys Adventures, #15)
A Con Artist in Paris, 15 (Hardy Boys Adventures, #15)
Scavenger Hunt Heist (Hardy Boys Clue Book, #5)
Attack of the Bayport Beast (Hardy Boys Adventures, #14)
Hardy Boys Clue Book Collection Books 1-4 (Boxed Set) (Hardy Boys Clue Book)
Talent Show Tricks (Hardy Boys Clue Book, #4)
Bound for Danger (Hardy Boys Adventures, #13)
Water-Ski Wipeout (Hardy Boys Clue Book, #3)
Hardy Boys Adventures Ultimate Thrills Collection (Hardy Boys Adventures)
The Madman of Black Bear Mountain (Hardy Boys Adventures, #12)
Hardy Boys Adventures 3-Books-In-1! (Hardy Boys Adventures)
The Tower Treasure #1 (Hardy Boys, #1)
The House on the Cliff #2 (Hardy Boys, #2)
The Secret of the Old Mill #3 (Hardy Boys, #3)
The Missing Chums #4 (Hardy Boys, #4)
The Video Game Bandit (Hardy Boys Clue Book, #1)
The Missing Playbook (Hardy Boys Clue Book, #2)
