James and Mr. White work in a call centre in Chennai. James witnesses the murder of Krishnamurthy, a labor union leader. He promises the police to identify the murderer. In order to crack the case, a police inspector Soundarapandian urges the lady informer Aishwarya to act as James's wife and stay in a house opposite to Krishnamurthy's. Upon coming to the house, the couple tries to crack the case. In this regard, they befriend the family, but soon, Krishnamurthy's father is also murdered. Towards the interval, one realises that James is the murderer. In order to avenge the murder of his parents by Krishnamurthy and his brother Ramamurthy a few years ago, James stays in the house opposite to theirs. With knowledge of his motive, Aishwarya promises to help him in bumping off Ramamurthy, who returns from Australia.