Drama starring Shirley Henderson as Kath, a woman still haunted by the mysterious disappearance of her sister Annie (Natalie Henderson) two years earlier. When she steals a security camera videotape from the police that captures Annie's last moments, Kath believes she finds a mysterious image on it. As she retraces her sister's last steps, she has recurring visions of Annie in an otherworldly landscape. Whilst Kath becomes convinced that her Annie is trying to reach her, those around her become increasingly sceptical of her claims. Has she really found a way to access the afterlife, or is she losing her grip on reality? And what exactly did happen to Annie?