Ian McEwan’s novels are drawn to enclosed spaces. There is the squash court upon which the surgeon plays a meticulously described game in Saturday, and the honeymoon suite in a little seaside hotel for the awkward newlyweds in On Chesil Beach. In Atonement, the mother is kept in her bedroom by migraines while her daughter (spoiler alert) dies in a bomb-hit Underground station, and in the famous opening to his early novel Enduring Love a child is carried away in the basket of a hot air balloon.