In "The Red Pyramid," the first book of the Kane Chronicles, we met Carter and Sadie Kane, a brother and sister who are descendants of the House of Life from Ancient Egypt and therefore able to perform magic. However, being part of the House of Life brings some big problems into Carter and Sadie's lives. The first book in the series found them fighting to the control Ancient Egyptian gods that had been unleashed in the modern world. In "Throne of Fire," they face their most threatening enemy yet--the snake Apophis, who will bring Chaos to the entire world if he is released. If they don't prevent him from breaking free in four days, the world will end. To fight the forces of Chaos, the Kanes must revive the sun god, Ra. But first they have to not only search the world for the three sections of the Book of Ra but also learn how to say the correct spell.
Although I think the Percy Jackson and Heroes of Olympus series are better, I have been enjoying the Kane Chronicles. The characters are fun and charming, and the text is full of Riordan's silly, sometimes corny humor (and I love it!). I think some parts jump around too much so it's difficult to follow the story, but for the most part I like the fast-paced action. I'm looking forward to the final book in the trilogy!