This extraordinary, magical novel is the story of Clare and Henry who have known each other since Clare was 6 and Henry was 36, and were married when Clare was 22 and Henry 30. Impossible but true, because Henry is one of the first people diagnosed with Chrono-Displacement Disorder: periodically his genetic clock resets and he finds himself pulled suddenly into his past or future. His experiences are alternately harrowing and amusing. They struggle to lead normal lives in the face of a force they can neither prevent nor control. "I was ridiculously entranced by Audrey Niffenegger's big, reckless novel...utterly convincing" (Daily Telegraph)