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The Mark of Athena

Rick Riordan

The third book in the Heroes of Olympus series is an unforgettable journey across land and sea to Rome, where important discoveries, surprising sacrifices, and unspeakable horrors await. Uniting with Jason, Piper and Leo after the dangerous quest in The Son of Neptune, Percy, Hazel and Frank wonder who will be chosen to fulfill the Prophecy of Seven, completing their group's number, and sail with them to an ancient land to find the mysterious Doors of Death.