The Marsden Mysteries

Help remarkable Victorian surgeon, Mr. Marsden, build a mystery machine with the power to change the lives of cancer patients. Follow him on a thrilling adventure with cryptic clues, riddles and unexpected challenges!

Marsden Mysteries team on the hospital steps
The Marsden Mysteries event team by the statue

It's a mystery, except for these important details ...

Join us on Saturday 29 or Sunday 30 September for an unforgettable adventure.

The remarkable Victorian surgeon, Mr. Marsden, needs your help to build a machine with the power to change the lives of cancer patients. Follow him on a thrilling adventure with cryptic clues, riddles and unexpected challenges to uncover the parts he needs to build the mystery device.

Solve the final challenge, reveal the machine and make a vital difference to the lives of people with cancer.

£50 registration fee per teams of up to 6 players.

Your team of super sleuths will encounter a series of tasks, questions and challenges, navigating via GPS on our app to the right locations, guided by our interactive map and live scoreboard.

The Marsden Mysteries event team posing

How to get started...

Sign up for more information!

Your challenge will begin in a secret location in either Chelsea or Sutton, where you’ll be welcomed by the team and then set off on your mysterious adventure. The challenge will take 2-3 hours to complete, and you can choose to take on rival teams and try to be the first to solve each conundrum, or go at your own pace.

Come on, Mr Marsden is waiting for you!

Sign up to solve the mystery

The first step on your Marsden Mysteries journey is to book your team's place.

There are limited places available for each date, so register your team today to make sure you don't miss out on a team treasure hunt like no other!

The Marsden Mysteries event team jumping

Start your fundraising

Help us continue to improve the lives of people affected by cancer by starting your fundraising as soon as possible. Set up a JustGiving page, then you can let your friends and family know how they can support you.

The more you raise before the day, the more bonus rounds, extra clues and challenges you'll be given!

Look out for our emails 

We'll send you all the details - including the start location, instructions of how to download the app and a QR code for your game. So keep a close eye on your inbox!   

And make sure you don't miss out - check your junk mail and add [email protected] to your contacts.

It was lovely spending time with the family, working together to solve the clues

The game is afoot!

The Marsden Mysteries event team running

We will use the information you have provided to communicate with you about your Marsden Mysteries.

We’d also love to keep you updated about how your support makes a difference and other ways you can help The Royal Marsden Cancer Charity. Please let us know how you would like to hear from us.

By email
By phone
By post

If you’ve already told us how you’d like us to contact you, you don’t have to do so again. You can change your mind at any time by sending us a message or by calling 020 7808 2233.

Your details are safe with us. More information about how we protect your personal data is set out in our privacy policy and supporter promise.