Percy Jackson and the Lightning Thief

Percy Jackson always thought he was a normal teenager until he found out he was a demigod. A demigod is a son or daughter of one of the many gods in this book. Who is his god parent? He found out he was a demigod one day when he and his mom were on the beach. She immediately rushes to the camp and when they are almost there the car crashes and the mom is grabbed and she disappears, but what grabbed her and did Percy make it to camp? You can find out the whole story if you read Percy Jackson and the Lightning Thief.