GREGORY MONE is the author of the New York Times bestsellers Bill Nye’s Great Big World of Science and the Jack and the Geniuses series (with Bill Nye), as well as the acclaimed Atlantis duology. He loves the water as much as Fish but admits he wouldn’t survive very long on a pirate ship. This story was inspired by the complex treasure hunts he used to set up for his family. He lives with his wife and three children on Martha’s Vineyard.