Play at your pace · usually 83 min 1.6 km Watford App-guided
Play in
English
The experience
About this quest
Step back into 1942 and enter the high-stakes world of WWII espionage! A Nazi spy has infiltrated Cassiobury Park with a decoded telegram that could change the course of history. As an MI6 operative, you must navigate the historic grounds of the Earls of Essex, solve cryptic puzzles at hidden canal locks, and track your target through the ancient Whippendell Woods. Will you stop the assassination before twilight?
Is this for you?
Who it's for
Families with primary-school-age children who love spies and codes play MI6 agents chasing a 1942 Nazi spy, solving easy puzzles at the canal locks and in Whippendell Woods on a free 1.6 km loop of Cassiobury Park that takes about an hour and a half. Choose another day when the river is high, and another outing if you want a guide to explain the park's history in person.
What makes this quest special
Highlights
Interactive History: Use a "Ghost Mill" viewfinder to see buildings that disappeared 70 years ago.Cinematic Storytelling: Solve a continuous narrative inspired by real WWII defense plans.Elite Puzzles: Experience authentic spy techniques like offset ciphers and logical elimination.Hidden Gems: Discover secret bunkers, WWII tank traps.
From people who played this quest
Good times. In their words.
3.00 / 5 ★
1 player ratings
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From your phone to the streets
A walk that turns into an adventure.
1
Open the app. You’re on your way.
Choose your pass, then open your quest in the Questo app. It guides you from the starting point.
2
Get outside. Follow your curiosity.
Discover real places and their stories on foot. Stop for a coffee or a photo, then pick up where you left off.
3
Crack a clue. Share a little victory.
Look around for answers, solve puzzles and enjoy the “we got it!” moments.
This quest features interactive puzzles you’ll solve in the real world.
Difficulty level: Easy 🟢😊
Ensure your phone is fully charged or bring along your trusty power bank
Don't attempt when the river is high
Family friendly
A little clarity before you go
Frequently asked questions
Where does the Cassiobury Park trail start and finish?
It starts at Point Alpha: The Recruitment Hub and is a loop, so the final stop, Point Omega: The Kill-Switch Signal, brings you back to where you began. Along the way you pass the Gade Siphon, a canal cryptogram and stops through Whippendell Woods.
How long does it take, and can we pause?
Most players take about an hour and a half, walking and puzzles included, over 1.6 km. There is no set start time and you can pause and carry on later. Make sure your phone is fully charged or bring a power bank.
Is it suitable for children?
Yes. It is rated easy and tagged family friendly, with a wartime spy story that suits primary-school-age children. They solve puzzles using what is in front of them, such as codes at the canal locks. Younger children may need an adult to help with the code-breaking.
Do we need to pay or book to play as a family or group?
No. It is free to play and there is no time slot to book. You play on a phone at your own pace, with no group to join and no guide, so the whole family or a group of friends can set off whenever it suits.
Is it all outdoors, and can we go in any weather?
The route is entirely outdoors, following the river and canal locks and passing through Whippendell Woods, so dress for the weather. Do not attempt it when the river is high; pick another day if water levels are up after heavy rain.
