Black movie deals with the underworld operations in Kochi City. Karikkamuri Shanmugham (Mammootty) who is a hit man and a contract killer. David Carlos Padaveedan (Lal) who is a lawyer who masterminds and controls the operations of the underworld in Kochi..David and Shanmugham are friends and Shanmugham does whatever David asks him to do. As a child Shanmugham was picked up from the slums by the local secretary of the Marxist Party (Janardhanan) and put in an orphanage. He grew up without any love and affection and turned out to be a real goonda. He becomes a ruthless and cold blooded killer. As the story goes, Shanmugham was entrusted with the custody of a girl by the party secretary. It turns out to be that the girl is his own daughter.