UBOS - Three Is a Charm

A mortie named Verne arrives at a magic school. He meets Gus, a half-elf second year junior wizard and Cassy, a third year junior witch. He also meets the evil twins, Lucretia and Borgia, and the headmistress Miss Crystalgazer. The talking book UBOS takes the three friends to the center of the earth, where an evil wizard Zarlak is stealing magic from the outside world.