To unmask a CIA mole spying for ISIS, John Wells must return to his roots and go undercover as an Arab jihadi-and hope he can survive it-in the new cutting-edge novel from the #1 New York Times-bestselling author. It is the most dangerous mission of John Wells's career. Evidence is mounting that someone high up in the CIA is doing the unthinkable-passing messages to ISIS, alerting them to planned operations. Finding out the mole's identity without alerting him, however, will be very hard, and to accomplish it, Wells will have to do something he thought he'd left behind forever. He will have to reassume his former identity as a hardened jihadi, be captured, and get put next to an ISIS prisoner in a secret Bulgarian prison. Many years before, Wells was the only American agent ever to penetrate al Qaeda, but times have changed drastically. The terrorist organizations have multiplied- gotten bigger, crueler, more ambitious and powerful. Wells knows it may well be his death sentence. But there is no one else.