THE SPRITE SISTERS - FOUR SISTERS, FOUR ELEMENTS, FOUR POWERS - FIRE WATER EARTH AIR The Circle of Power is the first title in the hugely successful Sprite Sister fantasy adventure series, which has sold over 550,000 books in Germany. A film of the book is currently being produced and will be released in German cinemas in 2019. Each of the Sprite Sisters, aged between nine and thirteen, has a magical power related to one of the four elements - Fire, Water, Earth and Air. When Ariel discovers her power on her ninth birthday, their circle is complete. The girls' magic must be kept secret, and used only for good; if not, the consequences could be dire. The Sprites' big house in the country is