Knights of Crystallia is the third action-packed fantasy adventure in the Alcatraz vs. the Evil Librarians series for young readers from #1 New York Times bestselling author Brandon Sanderson. In this adventure, Alcatraz Smedri has finally reached the Free Realms. Unfortunately, so did the evil Librarians, including his mother! Now Alcatraz must find the traitor among the Knights of Crystallia, make peace with his estranged father and save one of the last bastions of the Free Kingdoms from the Evil Librarians.