Gemma, a dental hygienist and single mother, discovers she’s a Courier—she can cross into The Further and bring things back. Her powers are inherited: her mother Ingrid had them, and Gemma always believed Ingrid’s breakdown was mental illness, until she uncovers the truth.
When Cyrus Lam—cult leader with promises of resurrection—learns of Gemma’s gift, he uses Gemma’s daughter, Maya, as a conduit to pull demons and spirits into the real world. With Elise Rainier’s help, Gemma fights to seal Cyrus’s pathway and save Maya.
In the final confrontation, Gemma convinces Maya to let go, reversing Cyrus’s hold over reality and dragging the house (with Cyrus and the demons inside) into The Further. The breached real world is left only as foundation; demons turn on Cyrus and tear him apart. Gemma and Maya survive.
The red door—a recurring supernatural gateway—isn’t destroyed in the main ending. But the mid-credits scene shows Cyrus still alive in The Further: strapped into a dental chair, being tortured by ghosts while Keyface locks the door, sealing him in.
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