Setarer Sur revolves round 5 mates -Sunil, Brajesh, Ranjan, Suhash and Avijit -who are all drawn to their frequent good friend, Basobi. Basobi appears to be near Ranjan. Then, she out of the blue declares she is going to marry Brajesh, as she has at all times been in love with him. Simply days earlier than the marriage, Basobi is discovered useless at residence and famend detective Kiriti is approached to unravel the case.