Holly

For over 20 years, Belasco House has stood empty. Regarded as the Mt. Everest of haunted houses, its shadowed walls have witnessed scenes of unimaginable horror and depravity. All previous attempts to probe its mysteries have ended in murder, suicide, or insanity.

But now, a new investigation has been launched, bringing four strangers to Belasco House in search of the ultimate secrets of life and death. A wealthy publisher, brooding over his impending death, has paid a physicist and two mediums to establish the facts of life after death once and for all. For one night, they will investigate the Belasco House and learn exactly why the townsfolk refer to it as the Hell House.

In Pamplona, capital of Navarra, Amaia Salazar is called in to investigate the death of a baby girl. The baby has red marks on her face, indicating she has been murdered. According to the girl's grandmother, the father tried to run away with the body, uttering something about an offering. She also mentions the Inguma - an evil being of Basque mythology that kills people in their sleep. The investigation takes Amaia and her team to the nearby valley of Baztan, where there have been an abnormally high number of similar cases - and some procedural irregularities.