The Name of This Book is Secret is by Pseudonymous Bosch. The first book in the Secrets series. Cas and Max-Ernest discover the Symphony of Smells, a case of vials of different scents, and become involved in the mysterious death of the magician who once owned it. Boys and girls will enjoy this entertaining series that reminds one, in a way, of the Mysterious Benedict Society books.
Ratings: 6th grade - 8 out of 10 - V (some violence).