A chance encounter with a terrorist introduces a psychiatrist, Dr. Purba Bannerjee to an anti-terrorist inspector, Anup Bhargava who helps her confront the cause of a childhood trauma ....What happens when that psychiatrist's search for a cure of her nightmare brings her face to face with another mentally unstable but intelligent killer, Sabyasachi Pal ? 89 is a saga of obsession, hatred, mind games and numbers..numbers from the past... The non-linear narrative shuffles between the past and the present and unravels the mystery that lays buried in Purba's heart.. 89 is a gripping crime thriller that journeys through trauma, psychological warfare, murders and finally retribution.