Raúl, in a desperate attempt to recoup his marriage to Ana, suggests spending Christmas in an isolated cabin on the mountains, along with their son, Nico. Then, Samuel turns up, a handsome carpenter in charge of repairing some flaws. Ana and Nico feel affection for him, what makes Raúl extremely jealous, an old feeling he thought to have overcome. He tries to dispel the intruder but finds out, with increasing anguish, that Ana and the carpenter meet on their own and seem to share a secret. He decides to invite Samuel to Christmas Eve’s dinner, trying to demonstrate their affair, but the evening goes by trouble-free. But something seems to be wrong: while going over the holiday photographs, Raúl notices that some of them reveal situations he does not remember happening. His obsession with Samuel starts again, so he decides to do research on him and approaches his house to prowl.