The Kidnapping

My name is Percy Jackson. I am the twice savior of Olympus and I still can't catch a break. I'm pretty sure that the Fates favorite thing to do is make my life a living Tartarus! It's already hard being a demigod but it gets even harder when I get kidnapped by a place called the School. I meet Max and the Flock but I still have one question... what are these things on my back? (I don't own the cover)