Vishwanth Natarajan, Adams and Venkatesh are a gang of friends, who always spend their nights together getting drunk and high. Everyone of them are able to emotionally relate to the each other as they are poor and in need of money for various personal reasons. In this situation, Vishwanth comes up with a plan to kidnap his niece, Baby Amrutha, as his sister is married into a really rich family. 

They cook up a fool proof plan, successfully kidnap Baby Amrutha, and keep her hostage at an empty bungalow for which Venkatesh works as a watchman. After this, they call up Vishwanth's sister and her husband and threaten them to give them a ransom of almost a crore. Meanwhile, Vishwanth stays back with his in-laws family and pretends to grieve his niece's abduction. When he witness's his uncle-in-law's ability to withdraw money within a few seconds, out of greed he keeps increasing the amount. 

After he is satisfied with the total amount, they all decide to spilt the money and let Amrutha go the following morning. But in a turn of events she gets to know that her own uncle, Vishwanth and his friends are the ones behind her abduction. So they all plan to kill her to save their identity. But, Vishwanth vehemently refuses murder his lovable niece.

So he proposes to them that he will surrender to his in-laws and that he will not talk about the others who were involved in this scheme. Yet, the they are unconvinced and stand by their decision to kill Amrutha. Whether Vishwanth kills his niece to save himself and others from the crime they had committed or saves her for the love he harbours for her forms the rest of the plot. 

Vishwanth Natarajan has pulled of his grey shaded character really well. His ability to emote his feelings at the scenes where he had to kill his niece were really appreciable. With luck, he sure has a bright chance at becoming a successful actor. Riythvika plays a brief yet a pivotal role, which she has done justice to. Other actors, Venkatesh, Adams and Vijayakrishnaraj have all played their parts neatly. 

Director JPR has attempted to make a movie which talks about child kidnapping, and to what desperate level people are willing to go for money. His idea and story line seems to be interesting, but he completely fails at delivering an interesting screenplay. The first half of the movie is draggy and then picks up pace when they execute the kidnap plan. All goes well and interesting until JPR decides to include unwanted horror elements in it. From then onwards the movie is really disappointing. 

Over all Onaaigal Jakkiradhai could have been an interesting action thriller, but due to poor direction and script work, JPR had totally mucked up the film. Adheesh Uthriyan has composed the music for this film and his background scores are decent. Magesh K Dev's cinematography skills come to the fore and he has shot well.  

In short, Onaaigal Jakkiradhai, has a disappointing climax.