The stars have disappeared.
An ocean has taken their place.
Twelve-year-old Nima Calder knows exactly when the sea should turn. But one morning, the water retreats beyond every line on her charts-and an impossible ocean appears above her town.
Then she discovers Rivo, a boy from Ossarae: a civilization of floating reefs, sailing cities and islands suspended beneath the sky-sea. His world is collapsing, and only nine moon-tides remain before both oceans are changed forever.
Every crossing between the worlds demands an equal exchange. Nothing can pass through without something else being surrendered.
When Ossarae's desperate leader prepares to save her people by sacrificing Nima's town, Nima must find another answer-one that no single map, calculation or person can control.
But Rivo is hiding a devastating truth, and saving both worlds may require them to choose between loyalty, home and each other.
A cinematic fantasy adventure about friendship, courage, belonging and the impossible choices that define us-perfect for young readers, families and adults who love emotionally layered stories.