Friday Reads: The Name of This Book is Secret

I've been raving about this book (and the rest of the books in the Secret Series) for years, so it seemed only proper to add it as a Friday Read:

The Name of This Book is Secret
by Pseudonymous Bosch

For: 8-12-year-olds

Genre: Mystery (and I will argue Humor as well)

Published: 2007

Description: 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.

Why I liked it: I'm a sucker for an off-beat narrator, and this is one of the best.  Plus, this book came with a warning not to read further than the title page, and the first two pages of Chapter 1 were Xed out.  (Literally.)  Who can resist a mystery like that?
---
Got any comparable titles?  Please share. I'm DYING to find another book like this one!  (Though I'm convinced that I may just have to write one.)

Happy weekend reading!