The lives of four people from different walks of life is affected by a disastrous road accident. The regret, remorse and realisation these characters undergo makes the crux of the film.

Ten-year-old Sembi and her grandmother Veerayi, an apiarist, live peacefully amidst nature in the hilly regions of Kodaikanal. They lead a beautiful life until three influential miscreants shatter all their dreams. After a tragedy the two escape and board a bus, whose Passengers from different walks of life try to help bringing justice to the duo.

A series of murders targeting twins leads a detective down a dark path of revenge and childhood trauma.