In the seaside town of Hamlet Wick, nine guests assemble for a New Year's Eve party to remember.
The owner of Hamlet Hall has organised a murder mystery evening with a 1920s twist, and everyone has their own part to play.
But the game has barely begun when one guest is found dead - killed by a fatal injury to the head.
With no phone signal and no way out of the house, the others are trapped with a killer in their midst.
Someone is playing by their own rules. And in a close-knit community, old rivalries run deep...