Nothing bad in this. I'm always on the look out for a book with no bad content. This one is a keeper. Loyalty, learning lessons on real friendship, growing up... plus enough action and heroism for the boys. Very Nice job.
I love reading a good story, and this series is definitely one I enjoy reading multiple times! There are many lovable characters that keep the story fun! The plots are pretty predictable (it was written for 7-12 year olds), but these books have many things that adults can enjoy!