Martin Westley takes a walk one day and accidentally triggers a series of events, transforming the walk into a tragicomic life-changing expedition. While strolling along the coastal path between the beaches at Bronte and Clovelly, Martin is struck on the temple and loses consciousness. On waking he gradually realises that he doesn’t know his name, has lost his memories and has no idea who he is. He meets his wife, Alex, who is indifferent to, indeed contemptuous of, him and just as mysterious as before to Martin. The family home is unnervingly free of any intimate traces of his existence. His son ignores him. Only his daughter Emily shows any concern for his well-being.