Vettam movie is wafer-thin about a petty thief who steals a precious chain and is on the run. A police officer (Radha Ravi) is on his trail as Gopi (Dileep) who meets a girl Veena (Bhavana) in the flight. Veena is on her way to break the marriage of her lover to a tycoon's daughter and both are forced to travel together.
Gopi hides the chain in Veena's bag but discovers that it is missing. He follows her and after a love-hate relationship become good friends. Gopi plans to make a fortune out of the chain but all his plans goes awry as the story unfolds.