https://www.youtube.com/watch?…
The film is actually based on a short story written by Konkona's father, Mukul Sharma. It was inspired by his experience in McCluskieganj, Jharkhand.
Sharma and his then-wife, director Aparna Sen, had bought a house there, where a planchette session went wrong, and ultimately led to the mysterious death of a participant, a Mr. Chris Tripthorpe.