An International Bestseller and Playboy Best Book of 2006

It has been years since Immanuel Kant's landmark philosophical work, Critique of Pure Reason, brought him fame throughout Europe and made him Königsberg's best-known citizen. Now, rumors have begun to surface of a new work by this aging but still acute mind. Yet unlike his earlier work, this book will not examine the mind of the average man, but the mind of the serial killer.

Detective Hanno Stiffeniis has been called to the city to find the culprit in an enigmatic string of murders. Are they part of a plot formed by Napoleon's spies to undermine the Prussian king, or the work of a solitary killer? The case would seem unsolvable, were it not for the assistance and unmatched intellect of his mentor, Immanuel Kant. Together the young detective and the elderly, eccentric philosopher must track down the killer who has the city by the throat.

Atmospheric, entertaining, and intelligent, this acclaimed novel is sophisticated, page-turning crime at its best.