Season 4, Episode 7:
When a camera and film belonging to a man murdered in 1987 are discovered in the toilets of a Soho pub, the team enters the glamorous but murky world of modeling to reinvestigate the young man's killing. When the film is tested and processed, the team discovers two images that stand out from the standard christening and wedding shots - a junkie shooting up and shot of a couple kissing. But it is not the images found on the film that raises eyebrows, it is the traces of sperm.
A motley crew of retired police officers re-opens troublesome cases that were never laid to rest.