Former soldier, Tom Price, and actress, Nia Williams, are attempting to re-establish their love after a Kremlin plot almost cost them their relationship and their lives. Now, MI5 Deputy Director Phillipa Davies asks them for a favour: a wellness check on Piotr Lebedev, a Russian defector who came over to the west some twenty years before. Tom and Nia don't know that Lebedev possesses the 'knowledge' - information that would destroy Russia's national security. The Kremlin desperately want him back. As the CIA and GRU hunt for Lebedev, Davies, driven by a personal secret, attempts to manipulate people and events from the sidelines. Bouncing from the UK to America, to Vienna, to Jamaica, Tom and Nia find themselves pulled deeper into the deadly high-stakes game of cat and mouse where issues of loyalty and honour are fluid, where the hunted become the hunters, and where love is severely tested.