Calvin Joyner, a mild-mannered accountant whose high school glory days are long behind him, reconnects with an awkward pal from high school through Facebook. After meeting up, Calvin’s mundane life takes an unexpectedly thrilling turn when he's thrust into the world of international espionage.
Set in the backdrop of the mystical city of Varanasi, Asur follows Nikhil Nair, a forensic-expert-turned-teacher, who returns to his roots at the Central Bureau of Investigation, and along with his former mentor Dhananjay Rajpoot, finds himself caught in a cat-and-mouse game with a brutal serial killer. What follows is a blend of suspense, mythology and the murders of some people totally unrelated.