The plot tracks a policy agent seeking evidence for the criminal activities of his father, a former healer who practices euthanasia to people in need of relief.[2]
Octavi Martí of El País wrote that Winter Diary is "an extremely ambitious and risky film, which produces a strange sensation of lack of footage".[4]
The review in Fotogramas rated the film 3 out of 5 stars, deeming it to be "an attractive film displaying a hermeticism that ends up becoming excessive", underpinning a game with "puzzling but suggestive results".[7]