"A vivid, harrowing journey." - Jenny Milchman, Mary Higgins Clark Award-winning author of A mass shooting at a Chicago beach leaves several dead and dozens injured. In the year before the crime, four individuals emerge as possible suspects. An apathetic computer programmer. An ex-college athlete with a history of hits to the head. An Army veteran turned Chicago cop. A despondent high school student. One of them is the shooter. Discover who and why. "Parabellum is taut, slow-burning crime fiction at its best. And it's a great deal more than that." - Paul Flower, author of If you like nuanced literary crime fiction that explores the depths of the human psyche, you'll love Greg Hickey's compelling and unforgettable novel.