I will admit that I didn't read the first book in the series, but actually it probably would not have changed my opinion on this one.
As it was a busy time at work, I decided that I would be able to listen to this rather than be slower and read a copy, so I borrowed my copy from the local library. Was the difference between listening and reading any different?
Not really. In point of fact the narration was very good, and it didn't detract from the reading experience.
Towards the end I did find that the teenage angst in the plot began to grate a little, however it was a reasonable offering of Young Adult fiction.
I also should comment on the weird German quote at the beginning - I couldn't see the point of it, and didn't feel it added to the tone of the book at all.
I will give the third book in the Mercy Falls series a go, just to see how it all pans out.