Ria marries to a police officer, Bidhan who is on the hunt for the notorious underground revolutionary, Sadhan. It so happens that Riya, inadvertently or otherwise, has been harbouring the "criminal" Sadhan. Moreover, Riya knew Sadhan in theri college days and they were very close, even intimate.
The incidents, traversing past and preset unfold during one night.
It is a cat and mouse game with bidhan and the DIG (CID) trying to match wits with Sadhan and Riya even as a flood of memories envelopes them.