One morning, Clara (Mireia Oriol), the teenage daughter of Mónica (Belén Rueda) vanishes under strange circumstances. Hours later, she is found dead. Mónica refuses to accept the loss of her child, and, driven to desperation, takes part in a dark ritual in where a mysterious man offers her a pact to save Clara's life. The next day, inexplicably, Clara comes back to life and Mónica's journey to hell has now begun.