We bought a set for my son and his friend for their tenth birthdays. They have LOVED them. I have also read them and think they are a great book for a 10 year old boy. My son's friend's mother said it was the first time her son couldn't put a book down. It is the same with my son. After an hour reading a night, he still wants to keep reading. Would thoroughly recommend these books. They have great fantasy incorporated with Greek mythology and iconic places in America (the National Mall, Hoover Dam etc).