Sentinel (Spycatcher Series #2)

The United States and Russia are on the brink of war and only Will Cochrane—the master spy introduced in the critically acclaimed Spycatcher—can find and unmask the diabolical double agent responsible in this enthralling espionage thriller, written by a real-life former field officer.

Fourteen days ago, CIA headquarters in Virginia received a cryptic message from an agent operating deep undercover. Unable to make contact, they were forced to turn to their deadliest operative—Will Cochrane. His mission is simple: infiltrate the remote submarine base in Russia, locate the MI6 agent operating under the code name Svelte, and decode his message—or die trying.

But now Svelte is dead. And it's up to Cochrane to uncover the meaning of his final message . . . and discover the identity of the man known only as "Sentinel."