Vishnupriyan is an aspiring director who stays with his close friends in a rented room. As he struggles to express his talents he meets 'Power Star' Srinivasan, who gets impressed with Vishnupriyan's idea and is ready to produce it for him, once he submits the final script work. 

However, due to his friends constant presence around him, Vishnupriyan finds it difficult to finish his script. So he decides to come up with a fake horror story to scare them off. He cooks up stories about how he could feel a woman's presence, who goes by the name of Merlin, in the house and that it haunts.

Soon after that, every incident Vishnupriyan tells them begins to happen in real for him. But, he absolutely begins to freak out when Merlin resemblance his ex-lover's, Aswini Chandrasekar, face. His friends soon fear for his sanity and they take him to a psychiatrist. The rest of plot revolves around him trying to figure out why Aswini is haunting him, with the help of the psychiatrist. 

Vishnupriyan has delivered an average performance, but he could have emoted the feeling of fear in a better way as he looked a little funny at the supposedly scary portions. Times are changing, and makers should make it a point to change the way a ghost is also represented. The cliched looks of Aswini Chandrasekar is not at all terrifying. Otherwise she has done a pretty decent job. 

Though V Keera's idea seems to be interesting and has done a decent job at the directorial department, he falls short on the screenplay front and has faltered by placing several unnecessary scenes, and lame as ever comedy. Maybe with good cast, improvised creativity and quality making the film would have been better. 

On the technical front, Ganesh Raghavendra has provided the tunes, and his scores are average. Muthukumaran's cinematography skills come to the fore and his shots are decent. 

In short, Merlin, is ok-ish.