If You're Reading This, It's Too Late (Secret, Book 2)

With sound as the subject of the second "secret" book, listening to the audiobook seems to be the way to go. The audiobook production did not disappoint. Music and sound effects are added perfectly to bring about the theme of the book. Cass and Max-Ernest are two weird kids that seem to just as easily fall victim to the plots of the evil Midnight Sun as they are to follow the terces society. They also meet up with a new kid, a guitar playing Japanese student, who helps them on their way.
The author does a great job of making sure the kids are really kids. They make lots of mistakes and let emotions make them do stupid things. They need to be rescued at times. They are themselves, with all of the weirdness it entails.
The "author" of the book is constantly breaking through the wall to interact with the readers/listeners. The chapters are also numbered in countdown fashion, with chapter one being the last chapter. It all helps you to fell you are part of the action, rather than just a passive participant.
As for the plot? Well, there was an alchemist that created a living homunculus and found great secrets. He treated his creation poorly. A court jester talked to the homunculus, fed him and befriended him. The homunculus eventually turned on his master, burying him and his notes. He was not able to destroy the notes, but he hid them with the grave and did not want anybody to find out. The midnight sun wanted this knowledge. They used other girls and a pop band (Skeleton Sisters) to help get them. The good kids have to save the day, if they can convince their parents to not ground them anymore. The kids also find out more about their life and parents.