A bunch of young men, prosecuting their higher studies in Bombay, are returning home by train for Christmas holiday. Amarchand Mehra, a wealthy contractor of the town, sends his daughter Manju to receive his son Ravi at the railway station. Manju receives her brother Ravi and also his jolly, boisterous crowd of friends- Bipin Bose, Jimmy, Tripathy, Naidu, Desai and Daljit Singh. Ravi gives a lift to all his friendsin his car and drops them one by one at their houses. Last of all Ravi drops Bipin at his house, and it is exactly here that he meets Mohini for the first time. Ravi falls for Mohini the moment he sees her. He does not suspect that his friend Bipin is already infatuated with Mohini. Mohini and Ravi meet again at a picnic. At this meeting, both hearts are aflame and both are drawn irresistibly to each other. Bipin reading the mute language of their eyes, withdraws, like a good friend, with a bleeding heart from the sphere of their ardent love.
Amarchand Mehra's junior partner, Malhotra, has a younger sister Pushpa, who makes frantic efforts to hook Ravi for a husband. But Ravi already belongs to Mohini.
Vacation over, Ravi goes back to Bombay with friends, assuring Mohini that he will come back after this exams in three months. He had said: "I will bring for you, my dearest, bangles of green glass from Bombay, come to your door as a groom, astride a white horse in a grand procession, led by an English band, and carry you away, my fairy queen, amid festive scene."
Mohini is now always lost in sweet thoughts of Ravi and in her day-drams sees bangles of green glass dangling before her eyes. But just at this moment all her exquisite dreams are cruelly shattered. Dr. Dixit, the family physician, declares Mohini pregnant. Mohini's mother, who is suffering from heart trouble, collapses from the shock at the news. Ravi's father flatly refuses to accept Mohini as his daughter-in-law. Not content with this, he whisks away Ravi along with him to America on the pretext that the former is suffering from heart trouble and has to have proper medical treatment, and thus gets Ravi admitted into an Engineering College there.
Mohini is expelled from college. Neighbours and people of the town ostracize Mohini almost as an untouchable. Mohini goes through all the hardships bravely, but she does not divulge the name of the father of the child she is nourishing in her womb. Ravi writes to Mohini many letters; but Mohini, convinced of Ravi's infidelity, consigns all his letters to the flame-without caring to read them.
Bipin, still in love with Mohini, proposes to marry her. Mohini declines. "One loves but once," she says. "I have loved and lost, andnow I don't want to be pitied.
Mohini gives birth to a lovely chubby child. By her innate good nature and strength of character, she soon endears herself,not only to the neighbours, but to the entire town.
Three years go by. Ravi gets back from America. But immediately on his return his designing father poisons his ears by concocting a story that only a few months back Mohini give birth to an illegitimate child, and that all the town knows that the child's father is none else than Bipin himself, who is now practising in town as a doctor. Ravi is dazed. The gulf between him and Mohini suddenly widens. Respecting his father's wishes, Ravi agrees to marry Pushpa. The marriage procession starts amidst festive scenes of music and fireworks. The procession begins to pass Mohini's house. Mohini's three-year old son, Ajay runs to the gate to see the joyous sight, while Mohini sits at the threshold of her house, subbing bitterly at her fate. The child, imitating others, showers flowers on the bridegroom. Suddenly a cracker bursts with the deafening report and Ravi's horse gets out of control. The child faints and falls to the ground. There is a big commotion. Ravi jumps down from his horse and lifts the child in his arms. They say it is Mohini's child. So Mohini's child is not six months old, but he is three years old! The whole truth flashes across Ravi's mind in a split-second. The child is his own, not Bipin's. Inspite of the protests of his father, Ravi declares himself to be the father of the child, and rushes to the loving arms of his beloved Mohini.
Mohini happily surrenders herself into the embrace of her long-lost lover. The band begins to play again and the crowd beams with joy.
Parents put their boys and girls together in the same schools and colleges, but they do not impart any knowledge of sex or matrimonial responsibilities to these adolescents with the inevitable result that oftentimes promising children ruin their life's happiness through sheer ignorance. The doctors are of no avail. "It is a crime to abet an abortion," they say, and decline to offer medical aid. This is the problem on which the delicate, progressive story of HARE KANCH KI CHOORIYAN is based.
[From the official press booklet]