It is 1914, the beginning of a blissful, golden summer - and the end of an era. Deyning Park is in its heyday, the large country house filled with the laughter and excitement of privileged youth preparing for a weekend party. When Clarissa meets Tom Cuthbert, home from university and staying with his mother, the housekeeper, she is dazzled. Tom is handsome and enigmatic; he is also an outsider. Ambitious, clever, his sights set on a career in law, Tom is an acute observer, and a man who knows what he wants. For now, that is Clarissa.As Tom and Clarissa's friendship deepens, the wider landscape of political life around them is changing, and another story unfolds: they are not the only people in love. Soon the world - and all that they know - is rocked by a war that changes their lives for ever.