The Mystic Mid-Region: The Deserts of the Southwest
The Mystery Queen
The Mystery of Witch-Face Mountain, and Other Stories
The Mystery of the Yellow Room
The Mystery of the Secret Band
The Mystery of the Ravenspurs
The Mystery of the Pinckney Draught
The Mystery of the Lost Dauphin (Louis XVII)
The Mystery of the Locks
The Mystery of the Iron Box
The Mystery of the Hidden Room
The Mystery of the Hasty Arrow
The Mystery of the Green Ray
The Mystery of the Four Fingers
The Mystery of the Fires
The Mystery of the Fifteen Sounds