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From Barnes & Noble
The power-packed third installment of Rick Riordan's Heroes of Olympus finally arrives in paperback! As the Prophecy of Seven continues to unfold, Percy, Hazel, Frank, Piper, Jason, and Leo join forces, but there remains one gaping question: Who will complete the prophecy? For Heroes of Olympus fans still flailing from The Son of Neptune's cliffhangers, The Mark of Athena will provide relief and sustenance.