Set in the backdrop of the Durga Puja in Kolkata, Kahaani is a desperate heart wrenching and suspenseful tale of a pregnant woman Vidya Bagchi in search of her missing husband. Just like the city-Kolkata, there are many twists and turns in Vidya's quest, wherein nothing is what it seems and danger lurks in every corner. Vidya's Kahaani moves deeper and deeper into the mystery, raising the stakes and putting her life more and more at risk, reaching a cataclysmic and devastatingly shocking end.