Puthiya Niyamam, the Mammmootty-Nayantara starrer social thriller hits the theatres on February 12th, Friday. The movie is written and directed by popular writer-director AK Sajan. Reportedly, Puthiya Niyamam revolves around the intercaste couple, Adv. Louis Pothan and Vasuki Iyer. Louis, who belongs to an orthodox Christian background and Vasuki is from a traditional Brahmin family.