The Mark of Athena Novel by Rick Riordan

The Mark of Athena by Rick Riordan is the third book in *The Heroes of Olympus* series. It follows demigods Percy Jackson, Annabeth Chase, Jason Grace, Piper McLean, and Leo Valdez as they embark on a dangerous quest to find and close the doors of death in the ancient city of Rome. The story centers around Annabeth, who is tasked with retrieving the powerful Mark of Athena to prevent the rise of the Earth goddess Gaea. As the group faces monsters, betrayal, and internal struggles, they must work together to stop Gaea’s forces from gaining control and ultimately avert a catastrophe.