The real mystery is not the plot twist. The real mystery is, what happened to our expectations about movies to make so many people think they can easily find a "better" X-mas movie somewhere else, making it OK to give this one a low rating? For the last few decades, some 95% of all the X-mas movies produced have come from Canada, using basically the same actors and writers, and they do not even come close to this one. This is a real movie that engages and holds the attention, with real talent both in front of and behind the camera. Cmon people, follow the example of the main character in LAST XMAS, grow up.
Review of Last Christmas
