Saturday, February 15, 2003. Oddly - he's never done such a thing before - Henry Perowne wakes before dawn to find himself already in motion, drawn to the window of his bedroom. He is a contented man - a successful neurosurgeon, the devoted husband of Rosalind, a newspaper lawyer, and proud father of two grown-up children, one a promising poet and the other a talented blues musician. What troubles Perowne as he stands at his window is the state of the world - the impending war against Iraq, and a general darkening and gathering pessimism since the attacks on New York and Washington eighteen months before. Later during this particular Saturday morning, Perowne makes his way to his weekly squash game with his anaesthetist, trying to avoid the hundreds of thousands of marchers filling the streets of London, protesting against the war. A minor accident in his car brings him into a confrontation with Baxter, a fidgety, aggressive, young man, on the edge of violence. To Perowne's professional eye, there appears to be something profoundly wrong with him. Towards the end of a day rich in incident, a Saturday filled with thoughts of war and poetry, of music, mortality and love, Baxter appears at the Perowne home during a family reunion - with extraordinary consequences. Ian McEwan's last novel, Atonement, was hailed as a masterpiece all over the world. Saturday shares its confident, graceful prose and its remarkable perceptiveness, but is perhaps even more dramatically compelling, showing how life can change in an instant, for better or for worse. It is the work of a writer at the very height of his powers.