651 books • 49 series
Three Great Hardy Boys Mysteries
Submarine Caper (Hardy Boys, #68)
Four-headed Dragon (Hardy Boys, #69)
The Hardy Boys' Survival Handbook
Shore Road Mystery (Hardy Boys Mystery Stories, #17) (The Hardy Boys 2-in-1 mysteries, #6) (Hardy Boys, #6)
Who Dun It Book
The Outlaw's Silver (Hardy Boys, #67)
The Infinity Clue (Hardy Boys, #70)
Nancy Drew and the Hardy Boys, Super Sleuths!
The Stone Idol (Hardy Boys, #65)
The Vanishing Thieves (Hardy Boys, #66)
Witchmaster's Key (Hardy Boys, #55)
The Pentagon Spy (Hardy Boys, #61)
Mystery of Smugglers Cove (Hardy Boys, #64) (Hardy Boys Mystery Stories, #64)
Mummy Case (Hardy Boys, #63) (Hardy Boys (eBook), #63)
The Apeman's Secret (Hardy Boys, #62) (Classic American Writers)
Sinister Plots (Hardy Boys Casefiles S.)
The Hardy Boys Handbook
Hardy Boys Detective Handbook
Mystery of the Samurai Sword (Hardy Boys, #60) (Hardy Boys (eBook), #60)
Masked Monkey
The Shattered Helmet
The Jungle Pyramid (Armada Classics)
The Clue of the Hissing Serpent
