"Stay out of the deep places," he said. "The Sea People are in the deep places." Aemi lives in a village carved from stones and surrounded by sea. She wins spear-throwing competitions in disguise and earns slaps from her spoiled mistress by talking back. She hates being a slave. She survives by remembering her mother's tales of home, a paradise called Perilous. Aemi intends to find it. But then, black ships rise from the sea in the night. Aemi is captured and taken to Itlantis, an underwater world of cities of glass, floating gardens, and strange and wonderful technology. She is determined to escape, even if it means conspiring with fellow prisoner Nol, who fills her with equal parts anger and desire. Even if it means impersonating her mistress. Even if it means fleeing into the territory of the Dron, the bloodthirsty barbarians of the deep. But when Aemi witnesses firsthand an attack by the Dron, she realizes not all is as it seems below the sea. And Perilous might be closer than she thinks.