Geneva, 2012.When a Russian intelligence officer approaches MI5 with vital information about the imminent cyber-sabotage of an Anglo-American Defence programme, he refuses to talk to anyone but Liz Carlyle. But who is he, and what is his connection to the British agent? At a tracking station in Nevada, US Navy officers watch in horror as one of their unmanned drones plummets out of the sky. Is this a Russian plot to disable the West's defences? Or is the threat coming from elsewhere? Liz and her team hunt for a mole inside the MOD in a race against time to stop the Cold War heating up once again ...