Olive Wellwood is a famous writer, interviewed with her children gathered at her knee. For each of them she writes a separate private book, bound in different colours and placed on a shelf. In their rambling house near Romney Marsh they play in a story-book world - but their lives, and those of their rich cousins, children of a city stockbroker, and their friends, the son and daughter of a curator at the new Victoria and Albert Museum, are already inscribed with mystery. Each family carries its own secrets. Into their world comes a young stranger, a working-class boy from the potteries, drawn by the beauty of the Museum's treasures. And in midsummer a German puppeteer arrives, bringing dark dramas.