England, 1941. With London in the midst of the blitz, a group of children, led by their young teacher Eve (Phoebe Fox) and hardened headmistress Jean (Helen McCrory), are evacuated to the abandoned Eel Marsh House. With the aid of RAF pilot Harry (Jeremy Irvine) they seek safety from the bombs in the remote coastal location, however the group instead find themselves facing an evil far more frightening when their arrival awakens the Woman in Black.