Starred Review. Grade 7–10—In this first novel for young people set outside of Discworld, Pratchett again shows his humor and humanity. Worlds are destroyed and cultures collide when a tsunami hits islands in a vast ocean much like the Pacific. Mau, a boy on his way back home from his initiation period and ready for the ritual that will make him a man, is the only one of his people, the Nation, to survive. Ermintrude, a girl from somewhere like Britain in a time like the 19th century, is on her way to meet her father, the governor of the Mothering Sunday islands. She is the sole survivor of her ship (or so she thinks), which is wrecked on Mau's island. She reinvents herself as Daphne, and uses her wits and practical sense to help the straggling refugees from nearby islands who start arriving. When raiders land on the island, they are led by a mutineer from the wrecked ship, and Mau must use all of his ingenuity to outsmart him. Then, just as readers are settling in to thinking that all will be well in the new world that Daphne and Mau are helping to build, Pratchett turns the story on its head. The main characters are engaging and interesting, and are the perfect medium for the author's sly humor. Daphne is a close literary cousin of Tiffany Aching in her common sense and keen intelligence wedded to courage. A rich and thought-provoking read.