The Name of this Book Is Secret

This story follows two eleven-year-olds, Cass and Max-Ernest, as they come together to solve the mystery of a dead magician and the clues he left behind. The story involves a mysterious box, a symphony, and dangerous experimentation, leading them on a series of hair-raising adventures against nefarious villains. As they uncover secrets, they must also navigate their own friendship and bravery. With over 2 million copies sold, this series promises thrilling, secret-filled escapades.