Percy Jackson and the sea of monsters

(Percy Jackson & the Olympians) You can't tell by looking at me that my dad is Poseidon, God of the Sea. It's not easy being a half-blood these days. You mortals can't even see the monsters we have to fight all the time. So when a game of dodgeball turned into a death match against an ugly gang of cannibal giants, I couldn't exactly ask my gym teacher for help