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Cosy Killer
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Cosy Killer

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An epic murder mystery subscription box containing new puzzles and clues every month.

Cosykiller is not your average book or board game, it’s not even your “run of the mill” subscription box – it is the exciting new monthly thrill you’ve been waiting for! Cosykiller is a storyline, which allows you to play detective every month and solve a great mysterious murder that is set in the golden age of fiction.

It’s time to get into character, fasten those thinking caps and solve the most thrilling puzzle you’ve ever played. Each monthly Cosykiller box contains helpful clues, keepsakes, ciphers, mementoes and more that you will need to unravel the epic mystery.

Will you solve the case before the final box? Explore a fun new challenge and put your detective skills to the true test with Cosykiller today.

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£60 RRP
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Solve an epic murder mystery with new puzzles and clues delivered to your door every month

  • The ultimate murder mystery game delivered directly to your door
  • New puzzles and clues delivered every month
  • Includes helpful clues, keepsakes, ciphers, mementoes
  • Perfect for the armchair sleuth
  • Historic replica items
  • Personalised story your or recipient's name and address included
  • Interesting characters and story – created by a UK published Crime Writer
  • Immersive storytelling experience
  • Player forums for open discussion
  • Great way to make new friends and take part in something unique

Cosykiller is a thrillingly fun murder mystery subscription box which happens to be the brainchild of Red Herring Games LTD.

For over 10 years, Red Herring Games have been award-winning murder mystery game providers – from supplying epic murder mystery events for small dinner parties to conferences and brand activation activities for major corporations. Now with the Cosykiller subscription box, everyone can enjoy an epic murder mystery game from the comfort of your armchair.

Whether you’re looking for an exciting new monthly thrill that will excite, intrigue and challenge you or a super fun activity to share amongst friends and family, then Cosykiller is the ideal subscription box for you.

Each monthly box is slightly different and contains new pieces of the storyline for you to fit together into the whole over 12 months, with 3 complete 12-month stories to explore, There’s always a cover letter from the person leading the investigation to start you on your way – and each box contains other contents, themed to the game, and have different parts of the puzzle to integrate together to give you a full picture.

Each story is made up of 12 monthly boxes, with your adventure starting at the time of the Raj in 1930's India, where a wealthy Marie Jones is found missing with just her journal sent to you across 12 deliveries to help piece together the mystery.

After solving the case, your adventure automatically continues to The Valley of The Kings, when an archaeology dig goes horribly wrong, it falls to you to establish whether it was the Curse of King Humanrah or someone else with an axe to grind

Your final case brings you to Malborough House. 1888 is a dark time for Victorian Britain with Jack the Ripper stalking the London Streets. Are the victims of Malborough House connected in some way to the atrocities that took place in Whitechapel all those years ago?


Are you ready to solve the epic mysteries? Indulge a challenging new thrill with a subscription to Cosykiller today.

Frequently Asked Questions

How does uOpen work?
You can order this subscription either for yourself or as a gift for someone. With most boxes you can pay monthly, in quarterly or 6-monthly installments, or annually, so choose which option you'd prefer. Then provide us with the delivery address and your payment details, and place your order. Once ordered, uOpen liaises with the subscription box seller and they arrange for your box to be delivered directly to you.

When will the first box in my subscription be sent?
Specific details for this box can be found on the ‘Subscription Overview’ section.

How does the subscription renewal work?
Your subscription will automatically renew every month, every 3 months, 6 months or annually, depending on what subscription term you select. The auto-renewal can be easily cancelled in your uOpen account, but must be done at least 24 hours before the renewal date, otherwise your next payment will be automatically taken.

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Box Overview

  • Cosy Killer is a monthly box product.
  • Cosy Killer typically despatches {{ CurrentSubscription.shippingLeadTime}} day{{ CurrentSubscription.shippingLeadTime > 1 ? 's' : '' }} after the order is placed.
  • Cosy Killer typically despatches {{ CurrentSubscription.shippingLeadTime}} day{{ CurrentSubscription.shippingLeadTime > 1 ? 's' : '' }} after the {{ addOrdinal(CurrentSubscription.cutOffCustomDate) }} of each month.
  • 3, 6, 12 month subscriptions are pre-paid in full upfront.
  • Non-gift subscriptions renew automatically (every month, 3, 6 or 12 months depending on the selected term).
  • Subscription auto-renewal can easily be cancelled (but must be done at least 24 hours before the renewal date).
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