Dragons in the Waters (ISBN 0-374-31868-9) is a 1976 young adult murder mystery byMadeleine L'Engle, the second title to feature her character Polly O'Keefe. Itsprotagonist is thirteen-year-old Simon Bolivar Quentin Phair Renier, an impoverished orphan from an aristocratic Southern family. The title comes from Psalm 74:13.