It's not everyday 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...

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Rick Riordan, dubbed "storyteller of the gods" by Publishers Weekly, is the author of five #1 New York Times best-selling middle grade series with millions of copies sold throughout the world: Percy Jackson and the Olympians, The Heroes of Olympus, and the Trials of Apollo, based on Greek and Roman mythology; the Kane Chronicles, based on Ancient Egyptian mythology; and Magnus Chase and the Gods of Asgard, based on Norse mythology.