He has a conversation with the other doctor - where talk about "projections" - where a piece of the subconscious mind breaks off the body and haunts the house, while the other half is still alive in fresh.
The book implies it is Faraday's ongoing psychic projections.
The movie implies a psychic splitting happened at the Doctor's childhood and a piece of his mind staed behind in its child state.
The book ending is better since it holds the Doctor more personally accountable and implies a more sinister pathology, while the movie implies it was merely a child-stage issue, and has nothing to do with the present Dr Faraday.
The book implies it is Faraday's ongoing psychic projections.
The movie implies a psychic splitting happened at the Doctor's childhood and a piece of his mind staed behind in its child state.
The book ending is better since it holds the Doctor more personally accountable and implies a more sinister pathology, while the movie implies it was merely a child-stage issue, and has nothing to do with the present Dr Faraday.