Maggie Stiefvater’s Blue Lily, Lily Blue is Book III in The Raven Cycle.  Blue Sargent’s mother, Maura, is missing.  Maura’s psychic sisters, Persephone and Calla, cannot locate her. Blue, Adam Parrish, Ronan Lynch and Richard Campbell Gansey III are still on a quest to find the cave that holds Glendower and perhaps the missing Maura. Others are trying to find Glendower as well. Persephone is coaching Adam to use his new found abilities and gives him this particular message: “Three in particular,” she murmured. “To be woken. Oh, no. No. Two. One should not be woken.”  It will be up to the Raven Boys and Blue to find the cave and figure out Persephone’s message.