In October 1940, the handsome young David Sparsholt arrives in Oxford. A keen athlete and oarsman, he at first seems unaware of the effect he has on others - particularly on the lonely and romantic Evert Dax, son of a celebrated novelist and destined to become a writer himself. While the Blitz rages in London, Oxford exists at a strange remove: an ephemeral, uncertain place, in which nightly blackouts conceal secret liaisons. Over the course of one momentous term, David and Evert forge an unlikely friendship that will colour their lives for decades to come.