Rhoma Grace, a 16-year-old from the House of Cancer, has an unusual way to read the stars, deciding to make up stories instead of following steps to make accurate predictions. When a violent explosion strikes the moons of Cancer, killing thousands of citizens — including its beloved guardian — Rho is surprised to be named the new leader of the House. As a true Cancrian who loves her home fiercely and will protect her people no matter what, Rho accepts. When more freak weather catastrophes occur, Rho starts to notice a pattern within the stars. Will anyone believe what this young novice says? How can she convince twelve worlds to unite as one Zodiac?