The Lost Hero Book PDF, you can easily download it here or read the complete book online right now. “The Lost Hero” is the first book in “The Heroes of Olympus” series by Rick Riordan. It introduces Jason, who wakes up on a school bus with no memory, holding hands with a girl named Piper, his supposed girlfriend. Their friend Leo and they are students at the Wilderness School, a boarding school for “bad kids”. After a freak storm and an attack by strange creatures during a school field trip, they find themselves at Camp Half-Blood. The book is filled with action, humor, suspense, and mystery.