This week's additions to the audio files on the book page are in the section titled "DETAILS":
#131. The Case of the Two-Cent Candy.
#132. If the Envelope Doesn't Fit, Forget It!
#133. It's All About the Mud.
#134. Think Billboard Sign. "We Care." "We Don't Care."
Collect them all, and when we're finished, you'll have an audio version of the entire book.