By means of his Indian coracle, Saravanan, a big-hearted boatman assures small connections and makes his living in this way. His younger sister Sivagami in fact so much. That's the way it goes, with Parvathi Ammal, their mother, that they love. When Saravanan has to gather endows her with Sivagami, he leaves his province for the neighbouring town. During his absence, a film unit came, under the leadership of a spirited director, Muthu (come for locations) who seduces Sivagami and rejects her then without arousing her suspicions, by going back to the capital. Parvathi Ammal discovers the pregnancy of her daughter Sivagami, who wants at all costs to cleanse her dishonour. She leaves for Madras to find Muthu. She meets accidentally one Valli, who is to be the beloved of Saravanan and becomes friendly (Both young ladies, on the other hand, do not know that they are sisters-in-law due to Saravanan). Valli, when to her, a saleswoman of lassi, with the well dipped character, had to resolve to avoid the ceaseless and more and more indecent harassment of her maternal uncle Somu, a gallows bird, by coming to hide in the big city. This last one also moves into the metropolis. Informed of the lot of his younger sister, Saravanan sees his mother succumbing in the confusion. The older brother decides in his turn to join Sivagami and to look for the man who is at the origin of all their misfortunes: Muthu!