I used to devour these when I was eight, so I had to pick this one up when I saw it at a library sale. It wasn't great, but it was actually a lot better than I expected. The character's voices were on-target, and the mystery was interesting, though painfully obvious from the start. The characters should have figured it out long before they did. Of course, it was dated -- a reference to listening to music on the hi-fi was especially amusing.