Alex Spellman works for British intelligence. He blames himself for a covert operation that went wrong in northern Spain. He is now getting headaches and blackouts and doesn't know why. Deanna Darby is sent from the CIA to gauge whether Spellman is a threat to national security on both sides of the Atlantic.
Vasili Dragunov has hatched a plan to get him back in favour at the Kremlin. It involves him gathering information to buy back his position of power.
Alex is chased from Spain to the US and back to his home turf in London while trying to ascertain who is after him and why, all the while being plagued by blackouts and memory loss. The remaining members of his team are being targeted and it is up to him and Deanna to ensure that national secrets are not lost to his pursuers.