Twelve year old Amira has only ever known a life at sea with her sea-witch mothers. So when their ship is wrecked in a great storm, Amira is delighted to have an opportunity to explore land - accompanied by her best friend Namur - a jinn. Amira soon finds a boy who has a jinn like her. When Namur goes missing Amira discovers she has to visit a magical place, a place where lost things can be found. But will Amira also discover her own destiny, and find out what it truly means to be a Moonchild?