651 books • 49 series
The Mystery of the Melted Coins (Hardy Boys Mystery Stories, #7) (The Hardy Boys 2-in-1 mysteries)
The Clue of the Screeching Owl (Hardy Boys Mystery Stories, #9) (The Hardy Boys 2-in-1 mysteries, #5)
Hooded Hawk Mystery (Hardy Boys, #34) (Hardy Boys Mystery Stories, #29) (The Hardy boys mysteries, #8)