The Mystery of the Flaming Footprints
M. V. Carey
The Mystery of the Singing Serpent
The Mystery of the Monster Mountain
The Secret of the Haunted Mirror
The Mystery of the Invisible Dog
The Mystery of the Death Trap Mine
The Mystery of the Magic Circle
The Mystery of Sinister Scarecrow
The Mystery of the Scar-faced Beggar
The Mystery of the Blazing Cliffs
The Mystery of Wandering Caveman