内容简介：
Matthew Walker is kidnapped by Internet hypnotist Diabolus and finds himself in a network of caves next to a rumbling volcano. He meets a young Wolfgang Mozart, and they discover that Diabolus has abducted them to teach his tone-deaf son Spike to play music. With the help of scientist Dr. Gildenstein, the boys manage to escape. They are transported to Mozart's home in 18th century Austria. Matthew finds plenty of material for his school history project. When it is time for Matthew to go home, Wolfie accidentally comes back with him and a series of funny adventures occur. Will Wolfie keep his identity a secret? He accidentally finds out the devastating truth about his existence and has to come to terms with this. But will he ever get home, now that the volcano has erupted and Dr. G. has vanished? Find out in this fast-paced, funny and informative novel.