The Discovery (based on Frances Sheridan) (1924) • The World of Light (1931) • The Gioconda Smile (play version, also known as Mortal Coils) (1948) • The Genius and the Goddess (play version, with Betty Wendel) (1957) • The Ambassador of Captripedia (1965) • Now More Than Ever (1997)
Children's books:
The Crows of Pearblossom (1944, published 1967) • The Travails and Tribulations of Geoffrey Peacock (1967)