Many Waters is a 1986 novel by Madeleine L'Engle, part of the author's Time Quartet (also known as the Time Quintet). The title is taken from the Song of Solomon 8:7: "Many waters cannot quench love, neither can the floods drown it. If a man were to give all his wealth for love, it would be utterly scorned."
The principal characters of the story are Sandy and Dennys Murry, twin brothers who are, ironically, somewhat out of place (they are "normal") in the context of the multifarious and eccentric Murry family from A Wrinkle in Time. The action of the story follows that of A Wind in the Door but precedes the climactic, apocalyptic events of A Swiftly Tilting Planet.
Read more about Many Waters: Plot Summary, Major Themes, Biblical and Other Sources of Immortal Character Names, Series Notes