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 installment in the "Percy Jackson & the Olympians" series and serves as the direct sequel to "The Battle of the Labyrinth". There is a statement at the end of the book referencing the close of "the first Camp Half-Blood series," indicating that there might be more to follow. "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.