In 1775, frontier scout Henri Thevenin disappeared into the wilderness, leaving behind a journal packed with secret ciphers, maps, and revolutionary messages. That journal has finally been decoded — and it’s coming to life as The Thevenin Cipher, the most ambitious America 250 experience yet.

The Thevenin Cipher is a hybrid guidebook + digital quest that turns your phone and a full-color physical book into a real-world Revolutionary War scavenger hunt. Following Henri’s trail, you’ll travel a 1,400-mile route through Virginia, West Virginia, and Ohio, solving authentic 18th-century-style puzzles at 17 historic sites.

From the Governor’s Palace in Williamsburg to Seneca Rocks, Prickett’s Fort, Sandstone Falls, and the final battlefield at Tu-Endie-Wei State Park, every stop brings the birth of America to life. You’ll crack Pigpen ciphers using printers’ names, decode date-shift ciphers from real historical years, follow compass bearings at thundering waterfalls, and complete on-site scavenger hunts that mirror the skills of Revolutionary scouts.

QR codes throughout the book unlock audio clips, photos, journal entries, and bonus clues from Zac Northup’s Beyond the Fading Darkness series. Whether you road-trip the full route, visit a few key sites, or play from home, the game works for families, history buffs, and puzzle lovers alike.

Perfect for America’s 250th anniversary, The Thevenin Cipher isn’t just a book — it’s your personal mission to rediscover the ideas, courage, and hidden stories that built the nation.

Ready to become a scout?