Islamic State prisoner in a secret Bulgarian prison has been overheard hinting that a senior CIA officer may be passing information to the Islamic State. The agency's top officials, and even the President, say the possibility is unthinkable. But John Wells and Ellis Shafer, his former boss at the agency, have reason to believe it. To prove their fears, Wells will have to reassume his former identity as a hardened jihadi, then get captured and sent to the same prison as the source. No other American has spent as much time inside the world of Islamist terrorists as Wells. He is the only CIA operative ever to reach the top ranks of al-Qaeda. Even so, he knows the men he is about to meet will test him to his limits. What he does not yet know is that the traitor and the Islamic State are planning a shocking terrorist attack, one that will have worldwide implications if it succeeds. Ultimately, Wells will have to risk everything he has to stop the mole ... and even then he may be too late."