This Book Is Not Good For You (Secret Series #3) by Pseudonymous Bosch

From Little, Brown Books for Young Readers:

Between the pages of this book lies the secret to the best-tasting chocolate in all the world. I promise, your taste buds will tingle. Your palette will sing! Oh no, have I accidentally tempted you to read this book? I will warn you, however, the most delicious things are never good for you…and this story is particularly scrumptious!

In this tooth-rotting adventure, Cass’s mom has been kidnapped by the evil dessert chef and chocolatier, Señor Hugo! The ransom…the legendary tuning fork. Can Cass and Max-Ernest find the magical instrument before it’s too late? Will they discover the evil secret ingredient to Señor Hugo’s chocolate success?

If you’re tempted, take a taste, but just remember…this book is not good for you.