When Edie O’Sullivan wins a two-day Christmas break in a hotel on a remote Scottish island, she’s looking forward to a picture-perfect Christmas full of winter walks, roaring fires, good books and even better whisky. But when a guest dies under mysterious circumstances, Edie realises that there is a killer amongst them.

As more guests begin to die, it's up to her to solve the strange riddles found in the victims’ Christmas crackers and stop the killing spree. But as she gets closer to the truth, she puts herself in the way of a devious and clever murderer. Can Edie solve these Christmas killings before she becomes the next victim?