Rural England, 1865. Katherine (Florence Pugh) is sold by her father, along with a parcel of land, to Boris (Christopher Fairbank), a bitter man twice her age, who forces her to marry his son Alexander (Paul Hilton).

When she embarks on a passionate affair with a young groom named Sebastian (Cosmo Jarvis) on her husband's estate, a force is unleashed inside her so powerful that she will stop at nothing to get what she wants.

Based on Nikolai Leskov's novella "Lady Macbeth of the Mtsensk."