The Incontrovertible Truth (S03E06)

The dark and corrupt streets of Whitechapel are witnessing a new breed of tourist - one from the higher realms of society wanting salacious entertainment. Yet Lady Montacute's curiosity means she now stands before the men of Leman Street charged with the vicious stabbing of a local woman. Over one long rainy night, H Division must unearth the true culprit before the weight of the authorities bears down upon them. (BBC)