Kathir plays an unemployed youth and is married to his sister's daughter, played by Reshmi Menon. During a casual conversation with his neighbour, played by Charle, he discovers that Charle is a secret police informer. He then convinces Charle and manages to get himself the job of an informant.
The first half is brilliantly written and manages to keep its audience engrossed throughout, the movie falters in its latter half as it loses pace abruptly. However, an interesting climax saves the day and turns this one into a watchable flick.
Kirumi is an interesting thriller that largely gets a simple yet unique treatment. It is definitely an honest attempt by its director Anucharan.