Abhay(Kamal Hassan) is the journey of a schizophrenic and fearless brother, whose past has wronged him and embedded its mark deep into his soul, creating a personal hell inside Abhay; A hell in which Abhay is living; A hell that haunts him every passing second and with every breath he takes. While Abhay spent most of his life in a mental asylum, his other twin Vijay(Kamal Hassan) was separated from him from childhood. Vijay is a commando that is due to marry his girlfriend, Tejashvari(Raveena Tandon), a news presenter for STAR TV, who is pregnant with his child. Wanting Abhay to share in with their celebrations, Vijay and Tejashvari decide to pay Abhay a visit at the asylum. A visit that meets with disastrous results. Abhay sees the reflection of his step mother in Tejashvari, a person who he immensely hated and caused his life to decay. Abhay's mission begins with Tejashvari, who he sees as an evil witch who is going to deteriorate Vijay's life, just like his step mother spoiled his fathers life. Abhay eventually manages to escape from the mental asylum and is now walking around free searching for the "witch" that his brother has just wed. Is the world safe from Abhay?

Kamal Hassan's story and screenplay is intelligent, well paced, innovative, engaging and extremely interesting. Character development is perfect. Each character has been well etched and contributes perfectly to the screenplay.