The Knights of Crystallia : Alcatraz vs. the Evil Librarians

Now in paperback for the first time, featuring all new covers, the Alcatraz Versus the Evil Librarians middle-grade series from #1 New York Times bestselling author Brandon Sanderson
In this third Alcatraz adventure, Alcatraz Smedry has made it to the Free Kingdoms at last. Unfortunately, so have the evil Librarians—including his mother! Now Alcatraz has to find a traitor among the Knights of Crystallia, make up with his estranged father, and save one of the last bastions of the Free Kingdoms from the Evil Librarians.