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The Mystery of Nelson's Stolen Diamonds: Old Portsmouth Treasure Hunt Adventure

Mystery Guides

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Turn the historic streets of Old Portsmouth into the world's largest escape room with this self-guided treasure hunt adventure!

Solve a range of cryptic clues including word games, maths puzzles, and hidden objects, as you unravel the historic mystery and discover the identity of the infamous diamond thief!

'The perfect blend of Portsmouth, puzzles, and history!'

On Horatio Nelson's last day on dry land before joining his ship to fight in the Battle of Trafalgar, he stored a valuable diamond necklace in a chest in one of Portsmouth many taverns for safekeeping. That night, the tavern was broken into and the necklace was stolen. You must solve the clues, eliminate suspects, and return to the scene of the crime to get to the bottom of this historic mystery. This treasure hunt is the best way to see the key historic sights of the city, visit its most atmospheric taverns, and soak up true local stories of its most notorious characters and places.

About This Deal


Discover tales of drunkenness, murder, and treason as you hunt the historic streets & taverns of Old Portsmouth for a mysterious diamond thief in this self-guided treasure hunt adventure!

Start any time you like... simply collect the treasure hunt activity book from The Dolphin pub in Old Portsmouth and away you go!

- Walking distance: 3km
- Duration: 2-3 hours

- 15% off food & drink in The Wellington pub (currently not selling alcohol, but is open for food and soft drinks as normal).
- 10% off food & drink in The Dolphin pub.

Stop At:

• Hotwalls Studios, Point Battery and Barracks, Broad Street, Old Portsmouth, Portsmouth PO1 2FS England
• Portsmouth Cathedral, High Street, Portsmouth PO1 2HH England
• The Round Tower, Broad Street., Portsmouth PO1 2JE England
• Royal Garrison Church, Penny Street, Portsmouth PO1 2NJ England

Additional Information

  • Confirmation will be received at time of booking
  • Wheelchair accessible
  • Stroller accessible
  • Service animals allowed
  • Near public transportation
  • Transportation is wheelchair accessible
  • Surfaces are wheelchair accessible
  • Not recommended for pregnant travelers
  • No heart problems or other serious medical conditions
  • Travelers should have a moderate physical fitness level
  • This is a private tour/activity. Only your group will participate
  • Social distancing enforced throughout experience
  • 44-page colour activity booklet containing all puzzles, clues, and maps
  • 15% off food & drink in The Wellington pub
  • 10% off food & drink in The Dolphin pub.
  • Full of amazing local history stories
  • 5 traditional taverns en route

  • Alcoholic Beverages

Departure Point
The Dolphin, 41 High St, Old Portsmouth, Portsmouth PO1 2LU, UK

Departure Time
5 or 6 people: (3 x booklets) 8/14/2020 - 8/8/2022
Monday - Sunday:12:00 PM - 08:00 PM
9 or 10 people: (5 x booklets) 8/14/2020 - 8/8/2022
Monday - Sunday:12:00 PM - 08:00 PM
3 or 4 people: (2 x booklets) 8/14/2020 - 8/8/2022
Monday - Sunday:12:00 PM - 08:00 PM
7 or 8 people: (4 x booklets) 8/14/2020 - 8/8/2022
Monday - Sunday:12:00 PM - 08:00 PM
1 or 2 people: (1 x booklet) 10/16/2020 - 8/8/2022
Monday - Sunday:12:00 PM - 08:00 PM

2 hours 30 minutes

Return Details
Returns to original departure point

Voucher Info
You can present either a paper or an electronic voucher for this activity.

The tour identified in this promotion is made available through Viator. Groupon is not affiliated with or sponsored by the Mystery Guides in connection with this deal. Please contact Groupon customer service for all inquiries related to this offer. Inquiries placed to Viator will be directed back to Groupon.

This offer is not eligible for promo codes.

Fine Print

14-day cancellation rights do not apply; no refunds or exchanges permitted. Voucher valid only for date and time listed; may not be exchanged or redeemed for other dates. Purchaser name and phone number must be provided at checkout; this information will be shared with Viator and the tour operator for purposes of order fulfillment. Groupon promo codes may not be used for this offer. Groupon voucher Terms of Sale do not apply. See the tour operator's terms and conditions for this offer here.