Heartstones is a novella by British author Ruth Rendell, published in 1987. It was also published by Longman in a special educational edition in 1990.
In a college town, two schoolgirls live with their widowed father Luke, a gentle well-educated man, meticulous and orderly. Elvira and Spinny are watchful, however, for Luke plans to remarry and has chosen Mary. The threat to the girls' world is removed when Mary falls to her death.