The Dragonfly Pool by Eva Ibbotson (Paperback, 2014)
The Dragonfly Pool by Eva Ibbotson is an enchanting tale of friendship and determination during the Second World War, from the author of The Star of Kazan.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 Karil, before it's too late?