The film’s plot is a masterclass in screwball comedy, following Gopalakrishnan (Dileep), a petty thief who steals a high-value necklace from a museum. His path soon crosses with Veena (Bhavna Pani), who is on a mission to sabotage her former lover’s wedding to a wealthy heiress.
Vettam (translating to "Light") tells the story of Philipose (Dileep), a small-time crook trying to steal a valuable diamond, and his unexpected companionship with Veerappan (Kalabhavan Mani). The film is a masterclass in situational comedy, often compared to the style of Hollywood films like It Happened One Night .