Queen Estelle has returned, and she will not stop until she has taken revenge on all those who have opposed her. Claire, Sophie, and their friends must convince Arden's four guilds of magic to set aside the past if they are to have any hope of a future. Because if the queen has her way, Claire and Sophie will never return home and the unicorns of Arden will be lost ...

forever. The thrilling third book in the series for fans of Cornelia Funke, Abi Elphinstone or The Chronicles of Narnia.