Daag - The Fire' is a story about a lawyer (Chandrachur Singh) who twists facts and rescues criminals from the clutches of the law by arguing in their favour. Under his instructions, his father-in-law, who is a builder, sets a mill on fire to make it available for a hotel project. The Municipal Commissioner, who puts up a stiff opposition, is arrested on a false charge of accepting bribes and later murdered in the cell. His son, a commando, seeks revenge and shots the lawyer and his wife. The lawyer, is however, saved but losses his memory. When he regains his memory later, he is transformed man and believes in upholding the truth. How he and the commando unite against the wrong people is the rest of the story.