The Thinking Machine on the Case

Uncle Abner: Master of Mysteries

49 Tales of The Thinking Machine (49 detective stories featuring Professor Augustus S. F. X. Van Dusen, also known as "The Thinking Machine")

Victorian San Francisco Novellas

Elusive Isabel

Masterpieces of Mystery

The Diamond Master

Firefly Junction Cozy Mystery Series: Books 1-3

The Leak

The Wonder Cats Mysteries 3-Book Box Set: Books 1-3

The Great Thinking Machine: "The Problem of Cell 13" and Other Stories

The Chase of the Golden Plate

The Complete Father Brown Mysteries (Unabridged)

Professor Augustus Van Dusen: 49 Detective Mysteries in One Edition: Adventures of The Thinking Machine