Four-part BBC crime drama starring David Threlfall and Russell Tovey. When young couple Michael (Tovey) and Vidya (Amber Rose Revah) move into a new flat they make a grisly discovery - the body of Melissa Young (Jessica Gunning), who hasn't been seen for two years but, bizarrely, had not been reported missing. Detective Inspector Len Harper (Threlfall) is assigned the case just a week before his retirement. His last case may well prove to be his most challenging as he sets about trying to make sense of the mysterious activities of Melissa's neighbours...