Michael Ennis’s historical thriller set in the Renaissance, The Malice of Fortune (Doubleday, $26.95) joins Machiavelli and da Vinci in a quest to unmask an enigmatic serial killer “. . . can stand shoulder to shoulder with Umberto Eco’s Name of the Rose . . .”— Kirkus starred review. Ennis has written extensively on subjects ranging from military preparedness and national politics to art and architecture. His is also the author of the historical novels Byzantium and Duchess of Milan.