Mugilan is a lovable and kind middle-class man who works as a forensic officer. He falls in love with Meghavathy Srinivasan aka Megha, who comes from a rich family background. Megha slowly starts developing feelings for him, and one day she finally reciprocates his love. But later, she also mysteriously disappears on the same day; the reason being is that Mugil's work leads him to incriminating evidence against Joseph Fernando, the police officer who is touted to be the next Police Commissioner of Chennai. Joseph had murdered Officer Raghavan, as he had considered him a threat to his promotion, but discovers that Mugil is on his tracks, hence Joseph tries to frame Mugil for murder and rape of Megha. Now it's up to Mugil to find his love. Their love undergoes many twists and turns, but how they reunite forms the rest of the story.
The film's soundtrack was composed by Ilaiyaraaja. The album features six tracks, one of which was "Putham Pudhu Kaalai" from the film Alaigal Oivathillai which was remastered in this film. Ilaiyaraaja himself had sung two songs in the film and his son Yuvan Shankar Raja had rendered two songs. Ilaiyaraaja stated that he agreed to compose the music since he liked the story and the screenplay. The music was well received by critics. The New Indian Express called Ilaiyaraja's songs and the score "the film's strength", and Sify wrote, "Ilayaraja owns most of scenes in the movie with his background score and is indeed a backbone for propelling the narration in the screenplay".
wrote, "The pace of the movie is too leisurely for a crime thriller. Also, not much importance is given to the crafting of the investigation episodes as has been given to the romantic interludes. One can feel a sense of imbalance in the narration as it shifts from one to the other". Behindwoods.com gave 2.25 stars out of 5 and wrote, "Gurudev's camera captures the beauty of rain in its majestic splendor which becomes the major highlight of the film. Karthik Rishi’s product is further strengthened by Ilayaraja’s scores and background tracks. However, the director scrambles to tilt these two major positives to his story's favor. Megha also wobbles weakly between the genres of romance and thriller resulting in a neither here nor there feeling for the viewer". Only Kollywood wrote, "Megha is a romantic thriller solely riding on the shoulders of Ilaiyaraja’s exhilarating background score. It has a wafer-thin, done-to-death plot which demanded a much better writing to make the audiences sit through the film". Sify gave a more positive review, writing, "Megha is an attempt that stands out from the run-of-the-mill template with an innovative screenplay".
