What Remains When the decomposed body of Melissa Young is found by a couple in their new flat, Detective Len Harper is determined to discover what happened to her and why nobody noticed she was missing. Details Casts Videos Galleries Posters Season Lists Title What Remains Genres Drama Mystery First Air Date 2013-08-25 Last Air Date 2013-09-15 Episode Runtime 01 Hours 00 Minutes Total Season(s) 1 Total Episode(s) on All Seasons 4 Runtime 60 Production Companies BBC Drama Productions David Threlfall... Len Harper... Denise Gough... Liz Fletcher... Lisa Millett... DCI Alice Yapp... Alexander Arnold... Adam... David Bamber... Joe... Claudie Blakley... Patricia... Jessica Gunning... Melissa Young... Victoria Hamilton... Peggy... Steven Mackintosh... Kieron... Amber Rose Revah... Vidya... Russell Tovey... Michael... Indira Varma... Elaine... Terence Beesley... ... Lee Nicholas Harris... Desk Sergeant... What Remains: Trailer - BBC One (Trailer) Original Size (1280x720) Original Size (1920x1080) Original Size (1920x1080) Original Size (756x1134) Original Size (600x882) Original Size (680x1000) Season 1 4 Episode(s) 2013-08-25