Ros is in real danger. His family are so desperate to save their drought–stricken farm that they'll sacrifice anything – even him – for rain. His only friend is Escher, an unseen entity with a voice that whispers in Ros's head, continuously warning him to leave before it's too late.
Escaping from his vengeful family astride a stolen camel, Ros decides to try his luck in the desert, discovering along the way a power he never knew he had. Through Escher, Ros learns to control the Change, a magical force that taps into the land, the water, fire and the air. He also meets Adi, a girl from a travelling clan of nomads, who asks him to save her from a future she's desperate to avoid.
When tragedy strikes, Ros seeks help from a powerful Stone Mage, but when even she can't save him, he starts to question everything that has happened on his journey. He must decide who is telling the truth, and who his real friends are.