Rick Riordan: 'House of Hades' is 'very intense'
This book cover image released by Disney Hyperion shows "The House of Hades," by Rick Riordan. The million-selling children's author is set for next week's release of the fourth book of his "Heroes of Olympus" series. Disney Hyperion, an imprint of Disney Publishing Worldwide, has announced a first printing of 2.5 million copies and the 600-page novel already is in the top 5 on Amazon.com. (AP Photo/Disney Hyperion)