Michael Jacob and Daniela De Gregorio write together as Michael Gregorio. Daniela teaches philosophy; Michael is interested in the history of photography. They live in Spoleto, a small town in central Italy. They have created a series of crime novels whose central charater is the Prussian magistrate, Hanno Stiffeniis. The series includes Critique of Criminal Reason, Days of Atonement, A Visible Darkness and Unholy Awakening.
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At the dawn of the Enlightenment, as the pursuit of criminal justice is evolving into a science, young Prussian magistrate Hanno Stiffeniis is confronted by a case of extraordinary evil ...