?Jack Campbell” is the pen name of John G. Hemry, a retired naval officer who graduated from the U.S. Naval Academy in Annapolis before serving with the surface fleet and in a variety of other assignments. He is the author of The Lost Fleet series (The Lost Fleet: Beyond the Frontier: Steadfast, The Lost Frontier: Beyond the Frontier: Guardian) as well as the Stark’s War series (Stark's Command, Stark's Crusade) and the Paul Sinclair series (A Just Determination, Burden of Proof). His short fiction appears frequently in Analog magazine. Imperfect Sword is the third novel in The Lost Stars series (Perilous Shield, Tarnished Knight).