content: "Hercule Poirot's Christmas" was one of my favorite stories by Agatha Christie. Thus, I already knew who did it when I watched this. The story does not perfectly follow the book -- the prologue in this version is missing from the book. And if I remember correctly, one of the son's names changed. To one who read the book, those elements and various other scenes were obvious. Enough to keep me from enjoying it? No. My hunch is one who hasn't read it may not put one and one together until the ending.A good way to enjoy the evening.