The Mark of Athena

The Mark of Athena is the third book in The Heroes of Olympus series. It is set to be released during the Fall of 2012. Thanatos gives the demigods a hint that the quest to find the Doors of Death must begin in Rome and in order to find them, a certain demigod must follow the signs.

A prophecy by Ella the Harpy, while with Percy, Hazel, and Frank, refers to this as well. Translated from Latin to English it says:

"Wisdom's daughter walks alone, The Mark of Athena burns through Rome."

Development
Rick Riordan has been working on The Mark of Athena since the competition of The Son of Neptune. While Amazon.com released information on the book, including a release date and pages numbers, Rick mentioned that the book wasn't finished yet so they had no way of knowing. During his tour to promote the last of The Kane Chronicles books, titled The Serpent's Shadow, Rick read the first chapter of The Mark of Athena. During the reading, it is revealed that Annabeth Chase is one of the narrators.

Synopsis
"In The Son of Neptune, Percy, Hazel, and Frank met in Camp Jupiter, the Roman equivalent of Camp Half-Blood, and traveled to the land beyond the gods to complete a dangerous quest. The third book in the Heroes of Olympus series will unite them with Jason, Piper, and Leo. But they number only six--who will complete the Prophecy of Seven?

The Greek and Roman demigods will have to cooperate in order to defeat the giants released by the Earth Mother, Gaea. Then they will have to sail together to the ancient land--Greece itself--to find the Doors of Death. What exactly are the Doors of Death? Much of the prophecy remains a mystery... With old friends and new friends joining forces, a marvelous ship, fearsome foes, and an exotic setting, The Mark of Athena promises to be another unforgettable adventure by master storyteller Rick Riordan."

Plot
While getting ready to land at Camp Jupiter, Annabeth Chase prepares by making sure the back-up plans are ready in case something goes wrong, as well as the back-ups to the back-ups. While Leo Valdez was flying the Argo II with a control system that involved Wii remotes and a monitor, Annabeth tried to keep Gleeson Hedge from attacking the first thing he saw. Jason Grace prepared by putting on a purple toga over his orange Camp Half-Blood t-shirt and Piper McLean practiced her lines for when they landed. As Annabeth watched Jason, she wondered if this could all be a trap as she was still a bit untrusting of Jason as he seemed to be too perfect. She also was reminded of how much she missed Percy Jackson every time she looked at him. Soon, the horns from Camp Jupiter sounded below as the camp spotted the Argo II.