I was searching for my 7 year old son a collection where he could follow the book or book heroes, without having read the previous to understand the history. I stumbled by chance on this series and we are excited both. Her because the stories he likes so much that he swallowed them up in an hour and me because what is written reflects reality (it does not seem to be an anachronism or other errors). The only catch is that at this rate (one per day on days when school is not), I do not stop to buy. Fortunately, the price is affordable.