The son of neptune

This is a very interesting book because it's an intireley different series than the lightning thief, but it has some of the same characters and problems. this is the second book in the second series, and in the first book, Jason, a hero from an unknown roman camp comes to camp half-blood and virtually replaces a missing Percy. In the second book, we meet an unknown Roman camp thats going crazy over the missing Jason, but when Percy arrives he goes on a quest with misfits Frank and Hazel to save, well,the world. They need to be back in four days,and if they don't the camp will be overrun by monsters, and it will be the beggining of the end. Some of the similaritys beetween the two books is that both Jason and Percy lose their memories. This can be very stressfull to read because you just want to yell at Jason or Percy because they're so close to find something out, but they can't remember. But I guess that this is good or else it would be to easy for the two camps to unite and defeat Gaea, the earth goddess who's planning to control earth. At the end of the book camp half-blood comes to help the roman camp, and then there's a cliff hanger.