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You and your friends were elated when you received invitations to the trendiest Halloween Party in Berkeley Square, London. Dressed in your finest costumes, you have been partying and having the time of your lives. But wait … something isn’t quite right. As the hours pass, it seems there are fewer and fewer people at the party. The room should be packed, but instead, the guests are gradually disappearing. As the last of the guests disappear, a mysterious locked box appears in the middle of the room. It is accompanied by a red envelope filled with creepy images, newspaper cuttings and other strange items. You know you ought to run but your curiosity gets the better of you. You need a three-digit code to open the box and you will have to solve a series of puzzles to find it out what it is. Will it contain a Trick or Treat?