A Russian arrives in Singapore with a secret to sell. When the Russian is killed and Sam Joseph, the CIA officer dispatched for the meet, goes missing, Artemis Procter is made a scapegoat and run out of the service. Traded back in a spy swap, Sam appears at Procter's doorstep months later with an explosive secret: there is a Russian mole within the upper reaches of the CIA. As Procter and Sam investigate, they arrive at a shortlist of suspects...