Providing fascinating back story to the Heroes of Olympus and Percy Jackson books, these tales follow favorite demigods as they face dangerous foes and perilous tasks. Readers will learn about Luke's early days adventuring with Thalia and Annabeth, and then find out how Percy and Annabeth helped Hermes get his lost staff back. They'll go behind the scenes at Bunker 9 as Leo tries to construct the ultimate flying ship, and will even meet a demigod who fought in Lord Kronos's army! In addition to the four action-packed stories, readers will find full-color portraits of important demigods, maps and diagrams, word puzzles, and a hidden message to decode. There's even an interview with Hermes's snakes! This top-secret collection is a must-have for fans of Rick Riordan's mythology series! Series Information Bestselling author Rick Riordan combines action, humor, suspense, and mystery in this epic adventure series that will have readers racing to turn the pages. As he did in Percy Jackson and the Olympians, Riordan offers a mix of classical mythology and modern adventure that may inspire kids to check out the original Greek and Roman myths!