The Name of this Book Is Secret — Pseudonymous Bosch

This is the story about a secret. but it also contains a secret story.

When adventurous detectives, Cass, an ever-vigilant survivalist, and Max-Ernest, a boy driven by logic, discover the Symphony of Smells, a box filled with smelly vials of colorful ingredients, they accidentally stumble upon a mystery surrounding a dead magician's diary and the hunt for immortality.

Filled with word games, anagrams, and featuring a mysterious narrator, this is a book that won't stay secret for long.