The Last Olympian is a fantasy-adventure novel based on Greek mythology by Rick Riordan, published on May 5, 2009. It is the fifth and final novel in the Percy Jackson & the Olympians series and serves as the direct sequel to The Battle of the Labyrinth. The Last Olympian revolves around the demigod Perseus Jackson as he leads his friends in a last stand to protect Mount Olympus. The book received many positive reviews. The title refers to Hestia, the goddess of the hearth, who refers to herself as such in a conversation with Percy on Mount Olympus.