Turin 1953. Lidia is a war widow with a ten year old daughter, Anna. She works in a factory, where does political work for the Communist Party.

In this adaptation of Tolstoy's story the Wurdulak, a mentally ill patient known as Nicola flashes back to horrifying experiences that he encountered while driving through the country. Upon damaging his car, Nicola sets out for help, only to meet a mysterious family that lives in total fear of someone or something. This evil force slowly penetrates the household and thrusts each of its members into a frenzy of absolute terror!