Allen Leech has been pulled from the comfort of "Downton" and placed into a much more unsettling setting, where he’s tasked with diffusing a conflict between “Ana” (Nina Bergman) and her former partner, “Vincent” (Yan Tual), at an isolated diner. Shortly after, he finds himself traveling on icy roads while being pursued by another vehicle, only to end up in an accident, which leads the narrative down an increasingly …