Charlie Bone and the Invisible Boy

This is the third book in the exciting and magical series about Charlie Bone. When Charlie's endowed classmate, Ollie, is rendered invisible during a Music lesson, it's up to Charlie and his friends to solve this mysterious occurrence and restore Ollie. The friends must unravel a myriad of plots that go all the way up to the sinister, magical world of the Red King, and Charlie learns how perilous the magic can truly be.