Guardians of time, book 3: The keyMarianne Curley2005

In the thrilling, final installment of the Guardians of Time trilogy, tentative guard members Matt and Rochelle have emerged as crucial players in fulfilling the prophecy of the Named. Matt has learned that he is the son of an immortal, while Rochelle is struggling with her newfound powers and her fear that the group doesn't trust her. In fact, their leader is certain that someone in the close-knit circle is a traitor-but who? As suspicions mount, friction threatens to tear apart the Guard. Will the members of the Named be able to overcome their fears and unite the Guardians of Time in their last stand against evil and chaos?

Titre original : Guardians of time, book 3: The key (2005)