Spooks series 8 opens where series 7 left off: Harry Pearce (head of MI5's section D) has been kidnapped and the rest of the team are racing to solve the mystery of his disappearance before it's too late. They discover that Harry thwarted a clandestine operation to smuggle weapons-grade uranium into Iraq to justify the war. Now the rogue officers, who masterminded the operation want their uranium back and are prepared to go to any lengths to get it, including bringing ex-Spook Ruth Evershead out of exile to blackmail Harry. In the meantime Lucas has struck up a rather too friendly relationship with new CIA recruit Sarah Caufield. Although she claims to be ushering in a new breed of liberal American agents, is she really all she seems?