Resa is Mortimer's wife and Meggie's mother. At the beginning of the novel, she makes it known that she is pregnant with another child. Her fear for Mortimer's safety cause her to seek words from Fenoglio that will return her entire family back to their original world, but when Fenoglio refuses, she asks the same of Orpheus. This proves to invite disaster, and Resa suffers from incredible guilt as the words she ask for lead to Mortimer's disappearance with the White Women. Though Mortimer quickly returns, the task he must undertake as a result puts him in greater risk, and this time Resa is willing to cooperate with her husband in order to help save his life and the lives of the innocent people in Ombra. Against the Black Prince's wishes, she goes to to the Castle in the Lake in order to help her husband, and takes a number of seeds from Mortola that allow her to take the form of a bird. From there, she enters the castle and does everything within her power alongside Dustfinger and Violante to help Mortimer find the White Book. Though she does not succeed, she throws herself in front of the Piper in order to save her husband and is wounded badly as a result. However, she recovers quickly, and remains with Mortimer and Meggie in the world of Ombra to raise her newborn child.
