"Great talent, great imagination, and real been-there done-that authenticity." -Lee Child "Not since Fleming charged Bond with the safety of the world has the international secret agent mystique been so anchored with an insider's reality." -Noah Boyd, author of The Bricklayer and Agent X Matthew Dunn knows his spycraft-and he proves it once again in Sentinel, his second electrifying Spycatcher novel. A former British M16 field officer trained in all aspects of intelligence collection, small-arms and explosives, military unarmed combat, and more, Dunn has an addition talent most other spies lack: he can really write! In Sentinel, Dunn brings back Agent Will Cochrane-whom Kirkus Reviews calls, "a Nietzschean hero who looks poised to give Lee Child's Jack Reacher a run for his readers"-and sends him to Avacha Bay in eastern Russia, where he must infiltrate a top-secret submarine base, decode a cryptic message from a deep undercover operative, and quite possibly prevent a devastating war. Espionage fiction fans who regularly devour the works of Daniel Silva, Robert Ludlum, Alex Berenson, Ted Bell, Brad Thor, Vince Flynn, and Barry Eisler will discover there's a new ace on the international thriller scene.