A couple is celebrating their anniversary in an enclave in the middle of an inhospitable icy place.

Sonia’s life was perfect at first. Her theatre career is improving and Óscar the man who is having an affair with her promises her to leave his wife for her soon. But suddenly her life descends into a downward spiral of terror when she receives photos of them two being together. This is the trademark of a serial killer who already has killed four women and now Sonia is the next target.

Two friends get together to prepare a film while a production team films the process.

Professor Jorge Ollot and Dr. Iris de Miguel have gathered a group of people, carefully chosen, with whom they will be isolated for a week in a secluded house. Their intention? To demonstrate that the paranormal exists, but that it is our own mind that provokes it.