It's a thriller in which puzzly geocachers are unusually qualified to seek a treasure. It is fun in much the same way the National Treasure movies are fun, but with better puzzles. If that sounds like fun to you, then I recommend this book. If that sounds not-fun to you, then I don't recommend this book. I don't tend to like thrillers, but I do like puzzles that are out in the world; I enjoyed this book.