If you take into consideration the time period these were originally written (the first part of the series) and the types of books being written at that time, this is pretty typical. ( )

This mystery set in Yellowstone National Park was a joy to read after just standing in some of the very places described in the book. The mystery was easy enough for my 5 year old to follow and still be surprised at the end. I do hope my young children don't think they can go hiking in Yellowstone by themselves but the Alden children are a pretty independent foursome. ( )