Sylah dreams of days growing up in the resistance, being told she would spark a revolution that would free the empire from the red-blooded ruling classes' tyranny. That spark was extinguished the day she watched her family murdered before her eyes. Anoor has been told she's nothing, no one, a disappointment, by the only person who matters: her mother, the most powerful ruler in the empire. But when Sylah and Anoor meet, a fire burns between them that could consume the kingdom--and their hearts. Hassa moves through the world unseen by upper classes, so she knows what it means to be invisible. But invisibility has its uses: It can hide the most dangerous of secrets, secrets that can reignite a revolution. And when she joins forces with Sylah and Anoor, together these grains of sand will become a storm. As the empire begins a set of trials of combat and skill designed to find its new leaders, the stage is set for blood to flow, power to shift, and cities to burn.