Margaret Lea, a London bookseller's daughter, has written an obscure biography that suggests deep understanding of siblings. She is contacted by renowned aging author Vida Winter, who finally wishes to tell her own, long-hidden, life story. Margaret travels to Yorkshire, where she interviews the dying writer, walks the remains of her estate at Angelfield and tries to verify the old woman's tale of a governess, a ghost and more than one abandoned baby. With the aid of colorful Aurelius Love, Margaret puzzles out generations of Angelfield: destructive Uncle Charlie; his elusive sister, Isabelle; their unhappy parents; Isabelle's twin daughters, Adeline and Emmeline; and the children's caretakers.