The Lost Apartment

A detective's investigation into a disturbing crime scene spirals into nightmare when a mysterious figure corners him in the building's hallway, leaving him battered and unconscious. He awakens in a similar apartment with no recollection of what happened, his body aching and his mind fractured. As the protagonist searches his prison for clues and a way out, he discovers correspondence between unseen inhabitants who share a chilling knowledge: they know exactly where he is, and they have no intention of letting him leave. What began as a straightforward case has become a fight for survival against forces both seen and unknown.