The captivating sequel to The Kingdom Over the Sea --which is "perfect for fans of Philip Pullman and Tahereh Mafi" ( Booklist )--follows Yara and her friends as they change the fate of the kingdom and their magic forever. Yara may have stopped the magical plague spreading its way through her new home, but to do so, she had to leave her mother in the hands of the sinister alchemists. Now Yara longs to return to Zehaira and free her mother from her prison. Yet when her mother's familiar arrives, close to death and bearing a message, Yara must put aside her plans to rescue her and instead set off with her friends to the official residence of the Grand High Sorceress, convinced it holds magic powerful enough to defeat the alchemists. After a treacherous journey, Yara finds her mother's house, and in it, a girl claiming to be the daughter of the Grand High Sorceress--a sister Yara didn't know she had. Meanwhile, the alchemists are circling ever closer, and the magic that Yara's mother was working threatens the foundations of their world. Yara is unsure if her newfound sister can be trusted, but she is going to need all the help she can get if she wants to save their mother and take back Zehaira from the alchemists' rule.