- The Tower Treasure
- The House on the Cliff
- The Secret of the Old Mill
- The Missing Chums
- Hunting for Hidden Gold
- The Shore Road Mystery
- The Secret of the Caves
- The Mystery of Cabin Island
- The Great Airport Mystery
- What Happened at Midnight
- While the Clock Ticked
- Footprints Under the Window
- The Mark on the Door
- The Hidden Harbor Mystery
- The Sinister Signpost
- A Figure in Hiding
- The Secret Warning
- The Twisted Claw
- The Disappearing Floor
- Mystery of the Flying Express
- The Clue of the Broken Blade
- The Flickering Torch Mystery
- The Melted Coins
- The Short-Wave Mystery
- The Secret Panel
- The Phantom Freighter
- The Secret of Skull Mountain
- The Sign of the Crooked Arrow
- The Secret of the Lost Tunnel
- The Wailing Siren Mystery
- The Secret of Wildcat Swamp
- The Crisscross Shadow
- The Yellow Feather Mystery
- The Hooded Hawk Mystery
- The Clue in the Embers
- The Secret of Pirate’s Hill
- The Ghost at Skeleton Rock
- Mystery at Devil’s Paw
- The Mystery of the Chinese Junk
- Mystery of the Desert Giant
- The Clue of the Screeching Owl
- The Viking Symbol Mystery
- The Mystery of the Aztec Warrior
- The Haunted Fort
- The Mystery of the Spiral Bridge
- The Secret Agent on Flight 101
- Mystery of the Whale Tattoo
- The Arctic Patrol Mystery
- The Bombay Boomerang
- Danger on Vampire Trail
- The Masked Monkey
- The Shattered Helmet
- The Clue of the Hissing Serpent
- The Mysterious Caravan
- The Witchmaster’s Key
- The Jungle Pyramid
- The Firebird Rocket
- The Sting of the Scorpion
You must be logged in to post a comment.