A Swiftly Tilting Planet is a science fiction novel by American author Madeleine L'Engle, the third book in the Time Quintet. It was first published in 1978 with cover art by Diane Dillon.

Dragons in the Waters is a 1976 young adult murder mystery by American author Madeleine L'Engle, the second title to feature her character Poly O'Keefe. Its protagonist is thirteen-year-old Simon Boli