Raja (Abbas) and Julie (Mumtaj) are lovers and they plan to elope to get married. On the way, they spot a murder of a minister which was committed by Varadappan (Anandaraj ). Varadappan tries to kill Raja and Julie as well, fearing them to be witness for the murder; however, they both escape and reaches Chennai. Chinnasamy (Sathyaraj) is a CBI officer who is appointed to investigate the murder of the minister. He comes to Chennai in search of Raja and Julie, knowing them to the only witnesses for the murder. Meanwhile, Nagarajan (Sivakumar) and Sivashankar (Jaiganesh) are leading businessmen in Chennai but are business rivals. Chinnasamy sets his eyes on Nagarajan, a close aid of Varadarajan, doubting him to be the murderer of Varadarajan when he is killed in a blast after his arrest. Sivashankar joins hands with Chinnasamy and helps him gather evidence against Nagarajan due to his business rivalry. Meanwhile, Raja and Julie accidentally get separated, and they keep searching for each other. Chinnasamy spots Julie and employs her as a maid in his home. Finally, Chinnasamy solves the case and finds that Sivashankar is the actual murderer. Chinnasamy pretended to doubt Nagarajan, which made him close to Sivashakar, helping him gather evidences. It is revealed that Sivashankar used Varadarajan as a spy employed with Nagarajan to know his business secrets and he was the real murderer. In the end, Raja and Julie are united with the help of Chinnasamy.