Dharmalingam (M.R. Radha), a rich landlord, is the father of two sons and a daughter. His eldest son has a love marriage with a poor teacher's daughter, Kamala,. Dharmalingam disowns them. The son dies and Kamala is left homeless, with a little child. Nathan (M.G.R.), a police officer, gives Kamala shelter in his house and decides to help her fight her case for property. But Kamala is murdered on the way to the court hearing. Fingers point at Dharmalingam and his son Shankar (M.N. Nambiar). Iron