India - a land of rich past and heritage and houses a plethora of stories and folklore. One of such paranormal stories is about Baak, the evil Ghost. Baak devours humans to quench its hunger, consumes the victim and adopts the shape of the prey. Saravanan is a lawyer from Chennai. His sister Selvi along with her husband and children start living in the palace in the village. Selvi?s husband dies mysteriously and later she also commits suicide. How Saravanan investigates the deaths is the rest of this horror thriller.