America's smartest sleuth solves his most puzzling cases yet

Professor Augustus S. F. X. Van Dusen may look and sound like an egghead scientist—because he is one—but there is no detective in the world villains fear more. With the help of his friend and sidekick, newspaper reporter Hutchison Hatch, the criminologist known as "The Thinking Machine" applies cold, hard logic to the most bizarre of mysteries—and always finds the solution.

In this comprehensive collection, Van Dusen investigates the enigmas of "The Midnight Message," "The Gap in the Trail," "A Fool of Good Intention," "The Woman in the Case," and many others. No matter how twisted the trail of clues—or diabolical the evildoer—the Thinking Machine knows that "two and two make four, not some times, but all the time." In other words, take heed, crooks—your cleverest schemes are not match for this genius detective.

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