NOT A HALLUCINATION

"I am a burnt soul with a body full of scars,
Thirsty for revenge and justice,
My pain and cries echoes through the walls of this place,
My only aim is to destroy the sleep of those people who erased my existence.", was the only words she said before disappearing and leaving her neck.
Sidharth Singh Minhas,a tea garden manager and his wife Shehnaaz Singh Minhas moves to 5,Eliot Hills,the manager's bungalow after their marriage.Everything was going well in their life when all of a sudden eerie things start happening in the bungalow and Shehnaaz starts to see someone who is not existing in real life.Is this just a hallucination or something else.