Am I Not Monstrous?

S2 E2: Only hours after she gave birth, a nameless young woman is found murdered in a stairwell at The London Hospital. The only suggestion of her identity is the strange protrusion at the base of her spine - a vestigial tail. This takes the team into the netherworld of circus freak shows and back to The London Hospital to seek help from its most celebrated resident, Joseph Merrick.