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.
Bamarre is plagued by a fatal disease called the Gray Death, which has three stages: Weakness, Sleep, and then Fever.
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.
Since a prophecy from a long ago specter states that 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 sky begins to lighten, and Addie tells Meryl, who is having the time of her life in battle, to run to the water and drink.
However, they offered to transform her into a fairy and join them in an endless battle against fearsome, monstrous creatures, the outcome of which affects the world below.
Rhys and Addie marry and live happily ever after, with Meryl as Fairy Godmother to their children and grandchildren, the first after hundreds of years.
When Meryl becomes sick with the Gray Death, Princess Addie emerges from her cocoon, her love for her sister overpowering her fear, and discovers a new strength and bravery.