In 2012, Sujoy Ghosh made a fantastic suspense drama titled Kahaani, which was powered by Vidya Balan's piercing performance. Four years later, he made Kahaani 2, which dealt with a far more chilling theme of child abuse. And talking about the one factor that unites the two films, it was a scary yet fascinating character of a detective out to hunt down the protagonist.

In the first one, we saw Bob Biswas, played memorably by Saswata Chatterjee, and that character is all set to get a film on his name. It's touted to be a spin-off to Kahaani and is being produced by none other Shah Rukh Khan and Gauri Khan under Red Chillies. Also collaborating with them would be Sujoy Ghosh, the creator of the franchise.