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Puthiya Niyamam is set in a metro city. The story unfolds the life of family court lawyer Adv. Louis Pothen (Mammootty) and his wife and dancer Vasuki (Nayantara). Their marriage was an inter-caste love marriage and they start having problems.
Adv. Louis Pothen is a master in dealing with divorce cases and in most such cases, he stands with the husband and tries to make a compromise so that the couples are not separated. He is a political observer and used to participate in channel discussions too. It is at this juncture that an unexpected problem affects the whole family and the consequent efforts of Louis to solve the issue form the rest of the plot.