A murder mystery game goes horribly wrong in this festive murder mystery set in a snowed-in country house and starring the real-life couple who invented Cluedo.

Christmas Eve, 1943. Anthony and Elva Pratt arrive in a snowy English village to run a murder mystery game – and instead discover a real murder.

The Pratts had planned for festive cheer, despite the wartime shortages: with Elva's map of the hotel and Anthony's prop weapons to use as clues, the guests in their parlour game would move through the rooms to figure out whodunnit.

But when Anthony discovers the cook's sister Miss Silver beaten to death, they instead find themselves investigating a shockingly real crime. The hotel manager Mr Browning is trying to keep the peace but the guests are agitated, Colonel Colman is about to take over the hotel for the war effort – and the mysterious Mrs Threadgold hasn't been seen at all.

In games, there's only one victim – but this is real life. Can the Pratts puzzle out this Christmas mystery before it's too late?