Very fun read, both for younger and older readers! It's a great read to start introducing kids to bigger words without confusing them or boring them. All the books in the series are quire short, older listeners could burn through a book in a day and younger won't find it so intimidating of a read.
The storyline has just the right balance of misfortune, mystery, and humor. They are meant for a younger audience, so it can be a bit childish for some people, but as someone who treasured these through middle school and quite likes juvenile fiction as is, I absolutely love these.