Ennai Theriyuma is the debut for Manoj, son of veteran Telugu actor Mohan Babu. The film is a remake of its Telugu original Nenu Meeku Telusa.

Adithya(Manoj) is amnesic. But his amnesia has some quirky limitations. Though he can function like any other normal individual during the day, a good night’s sleep effaces all facts related to his identity. Except Adithya, his uncle (Nasser) and his physician nobody knows about his condition. In order to keep him away from crooks who might exploit his vulnerability and also not to mar his sturdy, youthful image, the uncle and the doctor decide to keep the fact as a secret. Adithya’s employment in his uncle’s firm too provides him a nice getaway from the everyday trauma.

Howver, the duo also devise a practical way out of the problem. In order to evoke Adithya's memories, they record the details regarding his true identity in an audio cassette and play it every morning. Adithya is totally dependent on the cassette’s info and cannot survive without it.

Meanwhile, Madhumitha (Riya Sen), Adithya’s colleague falls in love with him. Adithya too takes a liking for her. When things seem to look up for poor Adithya, his uncle is brutally murdered and the body is found in his car. Moreover, the miscreants mess up his life entirely by robbing the cassette too. Adithya is left in the lurch. The blame of killing his own uncle is upon him and he is not sure about his own involvement in it. Besides, the cassette-his lifeline is lost.

Anjali I.P.S. (Sneha Ullal) arrives to investigate the murder. Coming to know about Adithya’s ailment, she makes him skip his sleep routine and tries to find the answers for all the questions. So what happens to Adithya? Does he manage to be helpful? Do Adithya and Madhumitha unite? Or does she fall a prey to his unsteady condition? Who is the killer? Is he somebody who knows about Adithya’s amnesia? Ennai Theriyuma has the answers.

Manoj has chosen a challenging script for his debut. Though novel at a few places, the film indeed reminds us of the blockbuster Ghajini in many ways. As a performer, Manoj has stepped into the industry well-prepared; his body language, dialogue deliveries and emotions are apt and show ample maturity. As usual Nasser has offered a measured performance to his character. Ennai Theriyuma has brought back Bharathiraja’s Taj Mahal heroine Riya Sen to the Tamil screen. She has taken up a negative character for her comeback and has also done well in it. For Sneha Ullal, the established heroine in Telugu, Ennai Theriyuma is her Tamil debut. She too has done a good job in the meaty role.

Camera by Sunil, stunts by Manchu Manoj and Tim Storms and music by Dharan are good. Director Ajay Sastri has tried his best to offer a big entry for hero Manoj through the thriller Ennai Theriyuma. The effort is commendable.