Hanno Stiffeniis Mysteries

In nineteenth century Prussia, Napoleon is attacking and Detective Hanno Stiffeniis is called in to solve some extremely enigmatic cases—with the assistance and unmatched intellect of his mentor, Immanuel Kant. Atmospheric, entertaining, and intelligent, Michael Gregorio’s acclaimed historical mystery series begins with Critique of Criminal Reason, an international bestseller named a Playboy Best Book of 2006.