Brilliant and boyishly charming, Emerson Knight likes nothing better than solving an unsolvable, improbable mystery. And finding a missing island is better than Christmas morning in the Knight household. When clues lead to a dark and sinister secret that is being guarded by the National Park Service, Emerson will need to assemble a crack team for help. Since a crack team isn't available, he enlists Riley Moon and his cousin Vernon. Riley Moon has...