The Son of Neptune

"In this book Percy reappears (after not appearing in the first book in this series, which upset a lot of people) in a Roman camp with no memories. Camp Half-Blood is in Long Island, and Camp Jupiter is in California, in the Oakland Hills. He has to immerse himself in Roman Army training, and goes on a quest with two people, to retrieve the legion’s eagle which they’d lost when travelling to Alaska. Alaska is called the land beyond gods, so gods cannot interfere. Along the way, they go through multiple adventures. They find the legion’s eagle with a giant who can’t be killed as long as it’s on its homeland, so they have to lure it away. At the end of the book there is another huge battle between the Romans and the giants’ armies."