The future will be perfect. No hate, no hunger, no war. Zed knows because he's seen it. He's from there. His mission is to ensure that history happens exactly as it's meant to. Even the terrible events. Even the one that's about to happen, the one that will destroy our civilisation for good. In present-day Washington, Zed watches as people go about their daily lives. People like Leo, a disgraced former spy; Tasha, a lawyer grieving for a brother killed in action in Iraq; Sari, the downtrodden employee of a foreign diplomat. Unlike Zed, they have no idea what difference their choices will make. The clock is ticking. But Zed has doubts. What are his superiors not telling him? What truths has he hidden from himself? And, as he becomes more entangled in the lives of those around him, will he be able to sacrifice their present for his future?