The 19 years old Thomas wakes up in a hospital after three years in a coma. He doesn't remember anything. The psychologist Anna tells him that his family has been murdered and that he is the only survivor of the massacre while his sister Laura is still missing. Physically weakened, Thomas attempts to piece together his fragmented memories. Helped by the psychologist, Thomas reconstructs his past to finally unmask the murderer and try to find Laura. But unsuspected truths and terrifying memories then arise from this mental labyrinth, which put the deed and the events of the past in a completely new light.