Once a hospital dedicated to treating tuberculosis, The Akureyri Sanatorium now sits haunted by the ghosts of its past. But a single wing remains open and houses six employees: the caretaker, two doctors, two nurses and a young research assistant. When one of the nurses, Yrsa, is found brutally murdered, a series of terrifying events are set in motion. With only six suspects, how has the trail run dry? Two decades later, the mystery remains unsolved. That is, until young criminologist Helgi Reykdal takes on the case. Can he finally put the terrifying secrets of the Sanitorium's past to rest?