The Genius Academy by Roy Apps

The second in the series of four thrillers chronicling Melvin Perkins’ battle against the Deadheads. When Cassandra Washbone, the tone-deaf school troublemaker, announces that she’s going to become an opera singer, Melvin is appalled. Such an awful idea can only mean one thing: the Deadheads are back. And what is the secret behind mysterious Genius Academy? Melvin must find out before he, Cassandra and all his friends are turned into deadheads.