Gemma and Terry must solve the murder of a wedding guest before they can say ‘I do'.

Gemma and Terry will be spending their first Christmas together as a married couple and are once again thrown into the middle of a murderous catastrophe.

Over the course of various Santa parades, present giving events and competitive Christmas challenges things start to take a very dark turn. Gemma tries her best to salvage their Christmas as the bodies start piling up, but can Terry finish preparing the Christmas dinner of his dreams and solve the murders in time?