My 10-year-old daughter told me I had to start reading the Percy Jackson series. It was the first time she got really excited about a series after she read Harry Potter. So, I jumped onboard. When We discovered that the story continued in The Heroes of Olympus, we were both all-in. The entire series has wonderful character development, and encouraging themes of uniqueness, independence, bravery and sacrifice. Most importantly it is all wrapped in a great story! Honestly, the best compliment I can give is that this is simply a "Damn good book". There are a few mature themes introduced and a fair amount of violence, I probably would not recommend this for a child under 10 to read independently.