Readers in the greater Washington, D.C., area with GPS devices may want to get themselves to N 39° 13.187 W 077° 04.941 this afternoon—that's the first in a series of checkpoints in a treasure hunt that bestselling author Brad Meltzer has put together with the Masonic Geocaching Society. (What's geocaching? Glad you asked!) According to the rules posted on Meltzer's website, "many but not all of the caches in the series will be puzzles and may require finders to seek them in order ... The final cache in the series will be a puzzle that will require clues from caches in the series to solve."

The clues, and the overarching story surrounding the quest, are connected to Meltzer's The Book of Lies. Here's a piece of the first clue, posted online, along with a picture of the trackable Masonic geocoins that are among the prizes to those who can solve the puzzle.