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...