The third book in the most exciting commercial fantasy adventure series since Artemis Fowl. Now with a thrilling new cover look.

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...

Rick Riordan is the mythmaster.