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...