Izzy has filled her house with nails, white cord, and secret patterns.

After her divorce, she retreats into a world only she can understand. Every wall becomes a map. Every note becomes a clue. Every memory pulls her deeper toward the basement of herself.

Then Isabelle appears. Colder. More dangerous.

What begins as a private ritual turns into a psychological descent through desire, obsession, and the terrifying question at the center of every life: Who am I when no one is watching?