Her works include biographies such as:
- *The Conquering Family* (1966), about the Plantagenets
- *The Three Daughters of King Wenceslas* (1971)
- *A Royal Marriage: The Strange and Scandalous Marriage of Princess Charlotte* (1974)
- *The Imperial Spy* (1976), a biography of Robert de Frissell
- *Behind the Veil: the extraordinary life and times of the extraordinary wife of Prince Charles Edward Stuart, Louise of Stolberg-Gedern* (1981)
- *The Six Wives of Henry the VIII* (1991)
- *Royal Bastards: The Children of Illegitimate Passion from Edward III to Edward VIII* (1992)
Other works:
- *The Moon in My Pocket: A Child's Journey Through China During the Cultural Revolution* (1973), on her experiences in China in the 1970s
- *The Great Imperial Gamble* (1977), on Imperial Russia
- *The Irrepressible Victorians: The Best and Brightest of the Great Age* (1979), on Victorian celebrities