Having been humbled by Yalta’s attack on their satellite network, the USA is planning air-strikes on Iranian nuclear facilities. Meanwhile, the team is suspended from the Grid following the Ros Myers affair, and, when utterly impotent and isolated, an old adversary of Harry’s appears out of the woodwork to inform them of a bomb he has planted in central London. Either innocent civilians or the team itself will perish. But who is really behind the threat?