A Visible Darkness, by Michael Gregorio, is the gripping new Prussian mystery, following the investigation into a psychotic serial killer.
About the Author
Michael Gregorio are Michael G. Jacob and Daniela De Gregorio. She teaches philosophy. He is interested in the history of photography in the nineteenth century. They have been married for over twenty-five years and live in Spoleto, a small town in central Italy. Days of Atonement
, their second novel, followed Critique of Criminal Reason. A Visible Darkness
is the third novel in the Hanno Stiffeniis series