Men of Iron, Men of Smoke (S04E04)

Just as it seems that Reid and Drake have found their working dynamic once more, they are forced to engage with a difficult murder case that threatens to open old wounds. A young man has been found murdered and the investigation takes the detectives to the Thames Ironworks and into the brutal world of Victorian football. When the case connects to a young worker named Thomas Gower, a man who Drake saved from the hangman's noose many years ago, fissures begin to emerge between Drake's and Reid's instincts. Jackson, meanwhile, is coming under increasing pressure from Long Susan over their son. (BBC America)