The two princesses of Bamarre - Gail Carson Levine

Another fantasy adventure from the author of ELLA ENCHANTED. Two princesses in a kingdom of magic, evil and sorcerors. When Princess Meryl succumbs to the terrible Grey Death, can Princess Addie overcome her fears and embark on a dangerous quest to find the cure?

Princess Meryl and Princess Addie, two sisters as close as can be, are growing up in a world full of magic. When their mother dies of the terrible Grey Death, a mysterious illness for which there is no known cure, they must look after each other. Addie looks to Meryl for inspiration - her brave, lively sister, full of dreams to emulate the epic adventures of the legendary hero, Drualt. But then Meryl succumbs to the unmistakable symptoms of the Grey Death herself. Addie knows that she must go out and find a cure. She will have to face ogres, spectres, gryphons and dragons along the way. Can she really find the courage for the epic task ahead?