49 Tales of The Thinking Machine (49 Detective Stories Featuring Professor Augustus S. F. X. Van Dusen, also known as "The Thinking Machine"‪)‬

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Professor Van Dusen is a fictional character in a series of detective short stories and two novels by Jacques Futrelle. Some of the short stories were originally published in The Saturday Evening Post and the Boston American.


In the stories Professor Van Dusen solves a variety of different mysteries together with his friend Hutchinson Hatch, reporter of a fictional newspaper called "The Daily New Yorker". The professor is known as the "Thinking Machine", solving problems by the remorseless application of logic. His catchphrases include, "Two and two always equal four," "Nothing is impossible", and "All things that start must go somewhere."

Table of Contents :


“The Thinking Machine”

My first Experience with the great Logician

A Piece of String

The Problem of the Perfect Alibi

The Problem of the Stolen Bank Notes

The Problem of Convict no. 97

The first problem

The Problem of the Crystal Gazer

Five Millions by Wireless

The Problem of the Green Eyed Monster

The Problem of the Hidden Million

Kidnapped Baby Blake, Millionaire

The Problem of the Missing Necklace

The Problem of the Motor Boat

The Mystery of the Ralston Bank Burglary

The Problem of the Opera Box

The Problem of the Cross Mark

The Problem of the Broken Bracelet

The Problem of the Lost Radium

The Problem of the Stolen Rubens

The Problem of the Souvenir Cards

The Problem of the Superfluous Finger

The case of the Scientific Murderer

The Problem of the Deserted House

The Mystery of the Fatal Cipher

The Mystery of the Flaming Phantom

The Problem of the Ghost Woman

The Mystery of the Golden Dagger

The Great Auto Mystery

The Grinning God

The Mystery of the Grip of Death

The Haunted Bell

The Jackdaw

The Problem of the Knotted Cord

The Mystery of the Man Who Was Lost

The Mystery of a Studio

The Problem of the Organ Grinder

The Phantom Motor

The Problem of the Private Compartment

The Problem of the Auto Cab

The Problem of the Red Rose

The Roswell Tiara

The Mystery of the Scarlet Thread

The Silver Box

The three Overcoats

The Tragedy of the Life Raft

The Problem of Cell 13

The Problem of the Vanishing man

The Problem of the Interrupted Wireless


Jacques Heath Futrelle (1875 – 1912) was an American journalist and mystery writer. He is best known for writing short...