01. The Tower Treasure
Franklin W. Dixon
011 While the Clock Ticked
014 The Hidden Harbor Mystery
015 The Sinister Signpost
016 A Figure in Hiding
017 The Secret Warning
018 The Twisted Claw
019 The Disappearing Floor
02. The House On the Cliff
020 Mystery of the Flying Express
021 The Clue of the Broken Blade
022 The Flickering Torch Mystery
023 The Melted Coins
024 The Short-Wave Mystery
025 The Secret Panel
026 The Phantom Freighter
027 The Secret of Skull Mountain
028 The Sign of the Crooked Arrow
029 The Secret of the Lost Tunnel
03. The Secret of the Old Mill
030 The Wailing Siren Mystery
031 The Secret of Wildcat Swamp
032 The Crisscross Shadow
033 The Yellow Feather Mystery
035 The Clue in the Embers
036 The Secret of Pirates' Hill
037 The Ghost at Skeleton Rock
038 Mystery at Devil's Paw
039 The Mystery of the Chinese Junk
04. The Missing Chums
040 Mystery of the Desert Giant
041 The Clue of the Screeching Owl
042 The Viking Symbol Mystery
043 The Mystery of the Aztec Warrior
044 The Haunted Fort
045 The Mystery of the Spiral Bridge
046 The Secret Agent on Flight 101
047 Mystery of the Whale Tattoo
048 The Arctic Patrol Mystery
049 The Bombay Boomerang
05. Hunting For Hidden Gold
050 Danger on Vampire Trail
051 The Masked Monkey
052 The Shattered Helmet
053 The Clue of the Hissing Serpent
054 The Mysterious Caravan
055 The Witchmaster's Key
056 The Jungle Pyramid
057 The Firebird Rocket
058 The Sting of the Scorpion
06. The Shore Road Mystery
07. The Secret of the Caves
08. The Mystery of Cabin Island
09. The Great Airport Mystery
10. What Happened At Midnight
12. Footprints Under the Window
13. The Mark On the Door