In the harsh winter that afflicted 1895 Toronto a serving girl is found dead in a laneway, stripped of her clothing. The inspector on duty decides that she simply froze to death, but Detective William Murdoch suspects foul play. When the autopsy reveals that the girl was pregnant, Murdoch starts questioning the family she worked for. The further he delves into the investigation, the more he is convinced that the people in her life are hiding things. Could one of them have killed her to cover up a scandal?