Freya Lyell is struggling to move on from her sister Stella's suicide five years ago. Visiting the bewitching Byrne Hall, only a few miles from the scene of the tragedy, she discovers a portrait of Stella - a portrait she had no idea existed, in a house Stella never set foot in. Or so she thought.

Driven to find out more about her sister's secrets, Freya is drawn into the world of Byrne Hall and its owners: charismatic artist Cory and his sinister, watchful mother. But as Freya's relationship with Cory crosses the line into obsession, the darkness behind the locked doors of Byrne Hall threatens to spill out.