Library of the Sapphire World (Over Where #1) by Jane Lindskold
Instead of mentors, they got monsters . . . That’s what Xerak, Vereez, and Grunwold think when three strange creatures shimmer into being within the circle of Hettua Shrine. Their conclusion is reasonable enough. After all, they’ve never seen humans before. As for Margaret Blake, Peg Gallegos, and Tessa Brown—more usually known as Meg, Peg, and Teg—they’re equally astonished but, oddly enough, better prepared. Then there is the mysterious verse that Teg speaks as they arrive, words that seem to indicate that the Shrine must have been at least partially responding to the request made of it.
Despite doubts on all sides, the three unlikely mentors join forces with the three young “inquisitors” and venture out into the world Peg dubs “Over Where.” First they must find the Library of the Sapphire Wind, destroyed years before. Will they find answers there, or is this only the first stage in their search?