Percy Jackson and the Olympians, Book Five The Last Olympian is the thrilling conclusion to the Percy Jackson & the Olympians series by Rick Riordan. In this action-packed fantasy novel, Percy Jackson and his friends must defend Mount Olympus from the powerful Titan lord Kronos and his army. As the final battle approaches, Percy must make a choice that will determine the fate of the Olympian gods and the entire world. With its gripping storyline and engaging characters, this book is a must-read for fans of fantasy and adventure.