When high-powered financial trader Victoria Bellweather impulsively purchases a haunting 17th-century portrait at Sotheby's, she has no idea she's inviting an ancient evil into her life. The painting—known as "The Portrait of Lilith"—soon reveals its malevolent nature, manifesting increasingly terrifying phenomena in Victoria's luxurious London penthouse.

Enter Adrian Valerius, a mysterious occult consultant who warns that the canvas houses a vengeful consciousness that feeds on fear and despair. As the painting's power grows, Victoria finds herself whisked away to Blackwood Castle, Adrian's ancestral home in the remote Scottish Highlands, where generations of his family have contained supernatural threats.

Trapped in this gothic stronghold, Victoria and Adrian must unravel the portrait's dark history while battling the entity's increasingly violent attempts to possess her. Their desperate search for answers uncovers forbidden rituals, ancient binding spells, and a centuries-old vendetta—all as their initial mistrust transforms into a profound connection that might be their only salvation against a darkness that refuses to remain confined to the canvas.