Nihita Biswas apparently believes that somebody has done black magic on her, and the only way she can keep it away from harming her is by keeping a Bhagavad Gita next to her bed.
Nihita reportedly was unaware of the rule of the Bigg Boss house that stops them from taking any sort of book with you inside, even if it's a religious book. Nihita Biswas fears that if the book is not with her, all the bad omens would return to haunt her in the house.
Sobhraj's wife is so upset that she spoke to the production house and created quite a drama in an effort to convince them to allow her to keep the book. However, the production house refused to relent.
Now it's for the viewers to wait and watch if Nihita can stay on in that house without the Gita or not.