The Dragonfly Pool--------pan macmillan

Tally Hamilton is furious to hear she is being sent from London to a horrid, stuffy boarding school in the countryside. And all because of the stupid war. But Delderton Hall is a far more interesting place than Tally ever imagined, and an exciting school trip to the beautiful and luscious kingdom of Bergania whisks Tally into an unexpected adventure . . . will she be able to save her new friend, Prince Tamil, before it's too late?