What Happened at Midnight
Franklin W. Dixon
The Yellow Feather Mystery
While the Clock Ticked
The Twisted Claw
The Viking Symbol Mystery
The Sinister Signpost
The Sign of the Crooked Arrow
The Shore Road Mystery
The Secret Warning
The Secret Panel
The Secret of Wildcat Swamp
The Secret of the Lost Tunnel
The Secret of the Caves
The Phantom Freighter
The Mystery of Cabin Island
The Mystery of the Chinese Junk
The Missing Chums
The Melted Coins
The Mark on the Door
The House on the Cliff
The Hooded Hawk Mystery
The Flickering Torch Mystery
The Great Airport Mystery
The Ghost at Skeleton Rock
The Disappearing Floor
The Crisscross Shadow
The Clue of the Screeching Owl
The Clue in the Embers
The Clue of the Broken Blade
The Arctic Patrol Mystery
Mystery of the Desert Giant
Mystery of the Flying Express
Mystery at Devil's Paw
Infinity Clue
Hunting for Hidden Gold
Mystery Map
The Secret of Skull Mountain
The Secret of Pirates' Hill
The Secret Agent on Flight 101
The Wailing Siren Mystery
The Tower Treasure
The Short-Wave Mystery
Short (1)