After suffering a devastating nervous breakdown, Katherine, a wealthy young heiress, retreats to her estate to heal under the close care of a perceptive private nurse named Luisa (Marisol Padilla Sánchez). Isolated from the outside world, the two women find themselves forming an intense emotional and physical bond. However, Katherine’s fragile recovery is violently disrupted when her sadistic, deeply psychotic ex-husband, Sonny (Matt Schulze), unexpectedly surfaces at the property. Discovering the relationship between the two women, Sonny begins executing a brutal, calculated campaign of psychological terror and physical violence, determined to destroy their bond and seize control of Katherine’s massive family fortune.