A painter (Kamal Addaraarachchi) has a girl that calls him uncle. She asks for his consent to marry a rich boy. He opposes by saying rich men only care about money. Then he relates his past to the girl. Then the story moves to a flashback. The painter has had a relationship with a girl from a rich family during his youth. He meets her in an art gallery and then gradually develops a relationship which culminates in making her pregnant. Then she requests him to meet her parents and she lies to them that he is a wealthy and rich person. In disgust, he leaves her. Then, after a long time, he finds out that she had lied to marry him. In other words, to get her parents' consent. He ultimately finds that the boy in the story is his son and his fiancée had died at the time of delivery. At the end of the story he commits suicide. At the end of the film the girl finds the painter dead on the floor.

The film is based on the political and cultural events of King Keerthi Sri Rajasinghe and his reign.

In this tale of deception and misadventure, a group of five village con men, each with unique skills, form a traveling performance troupe to camouflage their illicit actives. When approached by Swami, a con artist posing as a Hindu priest, they agree to pose as fake businessmen in a scheme to buy two Walampooris.

Directed by Professor Sunil Ariyaratne, 'Gautama Buddha Matha' is a cinematic portrayal inspired by the life of Mahapajapati Gotami, the revered queen and one of the earliest followers of the Buddha.