Overview
The Two Princesses of Bamarre is a 2001 novel by Gail Carson Levine, the author of Ella Enchanted and several other books. The story revolves around the lives of two sisters who are very close, but as different as night and day. When one of them falls victim to a deadly disease sweeping the kingdom, the other must find her inner strength and bravery to discover the cure, and save her elder sister.
Plot
Princess Adelina "Addie" is fearful and shy. Princess Meryl is bold and brave. They are sisters, and they mean the world to each other. Bamarre is plagued by a fatal disease called the Gray Death, which has three stages: Weakness, Sleep, and then Fever. While the weakness may last for hours to weeks, the sleep always lasts nine days, and the fever always lasts three. Bamarre also has specters, which lure travelers to their deaths unless exposed, sorcerers, ogres, dwarves, elves, gryphons, dragons, and fairies. Fairies, however, have not been seen since Drualt, Bamarre's greatest hero and subject of myths, went up to visit them after the tragic death of his sweetheart Freya.
The two princesses strike up a friendship with Rhys, the apprentice sorcerer helping their father. Soon after, Princess Meryl is suddenly struck ill with the Gray Death. Princess Addie has trouble coming to terms with the fact that Princess Meryl is going to die, while her elder sister tries in vain to prove her theory that the Gray Death might be cured if the person who is ill refuses to be sick, running when weak, staying awake when tired, etc. Since a prophecy from a long ago specter states that
The Gray Death will be cured
When cowards find courage
And rain falls over all Bamarre
When King Lionel returns just as cowardly as before, Princess Addie sets out to find the cure herself. Using a pair of seven-league boots and a magical spyglass from her deceased mother Queen Daria, a copy of Drualt, a camouflage cloak, a magic tablecloth from Rhys, some of Milton's herbs and Princess Meryl's sword Blood-Biter, Princess Addie successfully travels to the Mulee forest to find a specter, only to be tricked by one that took on the form of Rhys. The real Rhys makes her realize the truth, and she learns from the specter that a dragon would be her best bet for finding the cure. Rhys has to leave for the Sorcerers' Citadel, but not before Addie realizes that there's more behind their friendship.
From Wikipedia (CC BY-SA 4.0).