6'2 in this movie James (Sathyaraj) and Mr White (Vadivelu) work in a call centre in Chennai. James witnesses the murder of Krishnamurthy (Ajay Rathnam), a labor union leader. He promises the police to identify the murderer. In order to crack the case, a police inspector Soundara Pandian (Raj Kapoor) urged the lady informer Ishwarya (Sunitha Verma) to act as James' 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. Soon, Krishnamurthy's father too is murdered. Towards the interval one comes to know that the actual murderer is James himself. In order to avenge the murder of his parents by Krishmaurthy and his brother Ramamurthy (Raveendhar) a few years ago, James stays in the house opposite to theirs.
Coming know of his motive, Ishwarya promises to help him in bumping off Ramamurthy, who returns from Australia.