As a child, Gemma witnessed the horrific death of her mother, who had been unwell for a long time. Twenty years later, she works as a dentist, lives in the same house, and is raising her elementary school‑aged daughter. Suddenly, the woman begins to be tormented by realistic, terrifying dreams and is haunted by a trio of eerie old men. When one of them shows up for a visit, Gemma once again falls into a sticky nightmare, from which she is saved by Eliza Reiner — it turns out that Gemma may be a courier between our world and oblivion. And something sinister wants to take advantage of this.