In 1775, frontier scout Henri Thevenin vanished into the Virginia wilderness, leaving behind a trail of ciphers and riddles. In 1993, a mysterious lawyer delivered a black box to college student Jimmy Thevenin containing maps, letters, and encrypted clues collected by Henri’s descendants over two centuries.
That discovery changed everything.
The Thevenin Cipher is both a gripping novella and a real-world scavenger hunt. The book follows Jimmy as he receives the archive on his 21st birthday and begins unraveling a dangerous 250-year-old mystery.
The Thevenin Cipher Quest continues the story in real life. Using the official guidebook and physical answer cards, you’ll solve authentic Revolutionary-era ciphers at historic sites across Virginia, West Virginia, and Ohio. Crack Caesar shifts, Pigpen codes, and map overlays while walking the same paths Henri once took.
This is an active, multi-stage adventure designed for families, history lovers, and puzzle enthusiasts. Instead of reading about history, you’ll experience it firsthand — solving clues at places like Jamestown and chasing revelations near the New River Gorge.
The book provides the backstory and emotional stakes. The quest delivers the experience. Together, they create a complete journey that began in 1775, was rediscovered in 1993, and is now waiting for you during America’s 250th anniversary.
The Past is the Puzzle.
Are you ready to pick up where Jimmy left off?
Join us as a sponsor of the 2026 Thevenin Cipher and help bring America’s rich history and spirit of adventure back to life for a new generation.
Q: What is the Thevenin Cipher? A: The Thevenin Cipher is a unique hybrid experience that combines a thriller novella with a real-world scavenger hunt. The novella – one of my 90-minute read series – is set in 1993 as a young college student learns of a great family mystery that began during the American Revolution. The clues follow the story of Henri Thevenin, a Revolutionary War-era scout who left behind a series of ciphers and riddles. Participants use a guidebook and physical answer cards to solve authentic historical ciphers at real historic sites across Virginia, West Virginia, and Ohio. Think of it as your own version of the film, National Treasure.
Q: Is the Thevenin Cipher a book or a scavenger hunt? A: It’s both. The experience includes an origin story novella set in 1993 about a college student named Jimmy Thevenin who discovers a mysterious archive, plus a live, multi-stage scavenger hunt where you solve the same ciphers at actual historic locations.
Q: Who was Henri Thevenin? A: Henri Thevenin was a real historical figure — a frontier scout, trader, and ranger on the Virginia frontier during the American Revolution (1774–1783). He witnessed major events and left behind a coded trail of clues that his descendants protected for over 200 years.
Q: What happened in 1993 with the Thevenin Cipher? A: In 1993, a mysterious attorney delivered a black box containing the Thevenin archive to Jimmy Thevenin on his 21st birthday. This rediscovery brought the 250-year-old cipher trail back to life, forming the basis of the modern quest.
Q: How does the Thevenin Cipher scavenger hunt work? A: You receive a guidebook and a set of answer cards. At each historic site, you solve ciphers (including Caesar, Pigpen, and keyword ciphers), follow maps, and record your answers. It’s a self-guided, multi-stop experience designed to feel like stepping into Henri Thevenin’s shoes.
Q: Where does the Thevenin Cipher take place? A: The quest spans historic sites across Virginia, West Virginia, and Ohio — including locations connected to the American Revolution and the Virginia frontier. Specific stops are revealed through the clues and guidebook.
Q: Is the Thevenin Cipher part of America 250? A: No. At least not officially. The Thevenin Cipher was designed as an unofficial adventure for America’s 250th anniversary (Semiquincentennial) in 2026, celebrating the Revolutionary era through interactive, on-the-ground storytelling.
Q: What kind of ciphers are used in the Thevenin Cipher? A: The quest features authentic period-appropriate ciphers including Caesar shifts, Pigpen ciphers, keyword ciphers, symbol ciphers, and more. All ciphers are solvable with the materials provided in the guidebook and answer cards.
Q: Do I need any special skills or equipment for the Thevenin Cipher Quest? A: No special skills are required. A smartphone is helpful for navigation and photos, but the experience is intentionally low-tech and designed to be done offline at the historic sites.
Q: Who is the Thevenin Cipher for? A: It’s ideal for history enthusiasts, puzzle lovers, families, and anyone who wants an active, immersive way to experience American history. It’s especially popular with people who enjoy escape rooms, geocaching, or ARG-style experiences.
Q: How is the Thevenin Cipher different from a regular historical tour? A: Unlike passive tours, the Thevenin Cipher is an active puzzle adventure. Instead of being told the history, you solve it yourself using real ciphers and maps at the actual locations where events took place.
Q: Can I do the Thevenin Cipher alone or with a group? A: Both work great. Many people complete it solo or as a couple, while families and small groups often enjoy solving the ciphers together. It’s flexible and works well for 1–6 people.
Q: How long does the Thevenin Cipher Quest take? A: The full quest is a road trip that spans multiple locations and can be completed over several days or a weekend, depending on your pace. Individual stops typically take 30–90 minutes each. The special single location events take much less time. Typically, from beginning to end, players complete the events in less than two hours.
Q: Where can I buy the Thevenin Cipher book and quest materials? A: The official guidebook and answer card set are available on the Thevenin Cipher product page (link to your product page here). The experience is designed to be purchased once and used at your own pace.
Q: Is the Thevenin Cipher suitable for kids? A: Yes, with adult supervision. Many families enjoy it together. The puzzles range from beginner-friendly to moderately challenging, making it engaging for ages 10 and up.