User blog comment:SayuriDarling/The House of Hades Official Discussion/@comment-24308873-20131014175259/@comment-4531192-20131015092744

Also, I have to say, in defense of the author, that The Heroes of Olympus is a much darker series than Percy Jackson and the Olympians, and parents shouldn't assume it is safe for their children to read the former just on the basis that the first Percy Jackson series could easily be read by pre-teens.