Sananth, Deepak Paramesh, Anish Padmanabhan, Shashank Purushotham and Indhuja, are dumb and deaf, and are childhood friends. One day they all meet up for a private party at a hill station. In this situation, Sananth and Induja, confess their love to each other, after silently harbouring it for a long time. After a great evening, they all set out for a drive into the night. 

Unfortunately, they accidentally knock over Prabhudeva. They find him dead the moment the group of friends check on him. Out of fear, they all dump the body in a pit in an abandoned factory named Corporate Earth; a  factory which was responsible for mercury poisoning that affected several people, especially kids. After which they soon vacate the place. 

However, they visit the place the very next day to retrieve an ipod which one of the youngsters had misplaced it while dumping the body. And to their shock discover that, Prabhudeva's body is missing. From then onwards, various twists and turns occur where destiny doesn’t work in their favour. How these youngsters get themselves out of the situation is conveyed through out the rest of the film. 

The film that rides completely on Prabhudheva’s acting. Kudos to him for stepping out of his comfort zone and delivered a top-notch, creepy performance. The prosthetics used for his character has been handled professionally. The new kids-on-the block; Sananth, Deepak, Anish, Shashank and Indhuja have all played their parts really well. 

After cult films like Pizza and Jigarthanda, hopes were riding high on young director Karthik Subbaraj. Hence, he has tried his hands at a horror/thriller silent film. It's worth mentioning that, 30 years after Kamal Haasan’s Pesum Padam, 'Mercury', is the first film to be made in this genre.   

However, 'Mercury' isn’t exactly a silent film like Kamal’s classic as there are instances of screaming and moaning in the film. It is more like a sign language film. Karthik Subbaraj has handled the diretorial department really well. Though it takes some time to get used to the atmosphere of watching a "no dialouges" film, the making of the movie is at its best. Yet, it gets a little complex as the climax has been crammed with too many details, off the logic points at many places, and a lengthy screenplay. 

Tirru’s cinematography deserves a special shout out as it is on spot, and provides the audience a visual treat. Santhosh Narayan's background score is in perfect sync with the film. Especially, during the second half of the movie as it has moments of Santhosh Narayanan’s music which makes up for the silence, and gives us, the viewers a series of gooseflesh. His scores alone make it an edge-of-the-seat watch.

With a message conveyed, the film is a fresh attempt. After a drought of Tamil films in the last couple of months, Mercury will provide the entertainment that the Tamil audience has been craving for.

In short, Mercury, is a thrilling watch.