Which famous Cold War era British politician suspected to be a Soviet mole, still evaded being arrested by MI5? KGB Colonel Dimitry Zavrazin arranges defection to the West for his family and him with MI5 agent Craig Faulkner. In exchange, Zavrazin will bring a dossier with him identifying a prominent Establishment figure, codename Arrow Eye, to be a Soviet spy. In making the deal a reality, Zavrazin becomes subject to a full scale KGB manhunt when he begins his escape westward from East Berlin, his family already safe in England. After a firefight at a MI5 London safe house, the dossier disappears. Based on what little MI5 know about Arrow Eye, spycatcher Peter Wright knits together disparate information strands, proposing the true identity of the Soviet mole to Faulkner.