The Son of Neptune is about a boy named Percy Jackson is at another camp for Romans, and doesn't remember anything except the name Annebeth. I would read this book soon because he also meets new people, and also meets old people he knew, too.
The Lost Hero by Rick Riordan.
Yes, I would recommend this book to anyone who loves greek mythology as much as I do. First book of the Heroes of Olympus series is The Lost Hero. Second book is The Son of Neptune. The third book is coming out soon.