The protagonist on a probe to solve a series of murders that take place exactly where he delivers food.

For every action, there is an equal and opposite reaction. What happens when your small action affects so many people's lives? how the butterfly effect plays an important part in all our actions forms the crux of N4.

The story is about politics surrounding land and the plight of farmers. It showed Vijay helping poor farmers in their fight against the industries that have acquired their lands.

Detective Kaniyan Poonkundran is hungry for a challenging case to investigate and the mystery of a murdered dog leads to a rival who could be the match for him.

Saravanan and his two brothers go to their native village to make peace between their estranged father and three aunts, who hate their brother for having murdered their father.