When the moon-marked are called, the darkness will follow... The evil witch Emrysa is gathering strength to summon her Dark Army to life, and the Cheval sisters must find a way to thwart her once and for all. But while Morganne and Amara study dark magic with the king's magician in Camelot, Fae discovers darker secrets hidden beneath an alchemist's castle built on lies and deceit-a secret that will bring her closer to the evil witch than she ever anticipated. But with the evil army rising, the darkness descending, and the moon-marked morphing into otherworldly beings, Fae needs to do more than learn the art of alchemy to help protect the people of Camelot. She needs to learn how to open portals into other worlds, enlist help from ancient magical beings, and allow her dragon heart to roar. There are darker things than secrets, but can Fae handle the truth?