From Keeper of the Lost Cities. This is probably my fifteenth attempt.
Her name is pronounced SEE-ruh END-all
I always imagined it as SIE-ruh EN-dal.
If you don't know, Cyrah is the deceased wife of Prentice, mother of Wylie, and the one who made Lady Gisela's starstones. She is a Flasher, able to manipulate light.