Percy Jackson And The Titan's Curse (Book 3) - Rick Riordan

Half Boy. Half God. ALL Hero.
It's not every day you find yourself in combat with a half-lion, half-human.

But when you're the son of a Greek God, it happens. And now my friend Annabeth is missing, a Goddess is in chains and only five half-blood heroes can join the quest to defeat the doomsday monster.

Oh and guess what. The Oracle has predicted that not all of us will survive