The Secret Panel
Franklin W. Dixon
The Hardy Boys (25)
Clue of the Screeching Owl
The Hardy Boys (41)
The Secret Agent on Flight 101
The Hardy Boys (46)
The Arctic Patrol Mystery
The Hardy Boys (48)
A Figure in Hiding
The Hardy Boys (16)
The Twisted Claw
The Hardy Boys (18)
The Clue of the Broken Blade
The Hardy Boys (21)
While the Clock Ticked
The Hardy Boys (11)
Mystery of Cabin Island
The Hardy Boys (8)
The Secret of Skull Mountain
The Hardy Boys (27)
Footprints Under the Window
The Hardy Boys (12)
The Haunted Fort
The Hardy Boys (44)
The Disappearing Floor
The Hardy Boys (19)
The Viking Symbol Mystery
The Hardy Boys (42)
The Secret Warning
The Hardy Boys (17)
The House on the Cliff
The Hardy Boys (2)
The Tower Treasure
The Hardy Boys (1)
The Missing Chums
The Hardy Boys (4)
Hunting for Hidden Gold
The Hardy Boys (5)
The Shore Road Mystery
The Hardy Boys (6)
The Sinister Signpost
The Hardy Boys (15)
The Mark on the Door
The Flickering Torch Mystery
The Hardy Boys (22)
The Short-Wave Mystery
The Hardy Boys (24)
The Sign of the Crooked Arrow
The Hardy Boys (28)
The Clue in the Embers
The Hardy Boys (35)
The Secret of Pirates' Hill
The Hardy Boys (36)
The Mystery of the Chinese Junk
The Hardy Boys (39)
Mystery of the Desert Giant
The Hardy Boys (40)
The Mystery of the Aztec Warrior
The Hardy Boys (43)
The Mystery of the Spiral Bridge
The Hardy Boys (45)
Mystery of the Whale Tattoo
The Hardy Boys (47)
The Hooded Hawk Mystery
The Hardy Boys (34)
The Hidden Harbor Mystery
The Hardy Boys (14)
002 The House on the Cliff
The Hardy Boys Mystery Stories (2)
003 The Secret of the Old Mill
The Hardy Boys Mystery Stories (3)
004 The Missing Chums
The Hardy Boys Mystery Stories (4)
005 Hunting for Hidden Gold
The Hardy Boys Mystery Stories (5)
006 The Shore Road Mystery
The Hardy Boys Mystery Stories (6)
007 The Secret of the Caves
The Hardy Boys Mystery Stories (7)
008 The Mystery of Cabin Island
The Hardy Boys Mystery Stories (8)
009 The Great Airport Mystery
The Hardy Boys Mystery Stories (9)
010 What Happened at Midnight
The Hardy Boys Mystery Stories (10)
011 While the Clock Ticked
The Hardy Boys Mystery Stories (11)
012 Footprints Under the Window
The Hardy Boys Mystery Stories (12)
013 The Mark on the Door
The Hardy Boys Mystery Stories (13)
014 The Hidden Harbor Mystery
The Hardy Boys Mystery Stories (14)
015 The Sinister Signpost
The Hardy Boys Mystery Stories (15)
016 A Figure in Hiding
The Hardy Boys Mystery Stories (16)
017 The Secret Warning
The Hardy Boys Mystery Stories (17)
018 The Twisted Claw
The Hardy Boys Mystery Stories (18)
019 The Disappearing Floor
The Hardy Boys Mystery Stories (19)
020 Mystery of the Flying Express
The Hardy Boys Mystery Stories (20)
021 The Clue of the Broken Blade
The Hardy Boys Mystery Stories (21)
022 The Flickering Torch Mystery
The Hardy Boys Mystery Stories (22)
023 The Melted Coins
The Hardy Boys Mystery Stories (23)
024 The Short-Wave Mystery
The Hardy Boys Mystery Stories (24)
025 The Secret Panel
The Hardy Boys Mystery Stories (25)
026 The Phantom Freighter
The Hardy Boys Mystery Stories (26)
027 The Secret of Skull Mountain
The Hardy Boys Mystery Stories (27)