A newsstand owner takes pity on Qinawi, a lame young man, and gives him a job selling newspapers in the Cairo train station. The women there all shun him because of his mild handicap, though he has little trouble walking.
Qinawi becomes obsessed with Hannuma, a beautiful cold drink vendor. But she is engaged to Abu Siri, a husky luggage porter who is trying to organize his co-workers into a union to better their lot. Nonetheless, Qinawi proposes to her. When she rejects his fantasy of a home and children in his village, Qinawi's obsession turns to madness.
Inspired by an unsolved murder in the news, he buys a knife and plots to kill Hannuma. When the local policemen try to catch Hannuma and the other women illegally selling drinks, she asks Qinawi to take her incriminating drink bucket and hide it. He seeks to lure her to a warehouse to pick it up, but she asks a friend to get it instead.
In the darkness, Qinawi does not notice the substitution; he stabs the other woman repeatedly, then hides the body in a wooden crate supposedly holding Hannuma's trousseau. Then he gets Abu Siri to put it aboard a train for Hannuma's impending wedding. The woman is not dead, however. She is found, and the station is alerted. The men who stand to lose by Abu Siri's unionization at first try to pin the attempted murder on him, but the would-be victim identifies her real assailant. Meanwhile, unaware of her near escape from death, Hannuma goes to get her bucket. Qinawi chases her through the rail yard and catches her, holding a knife to her head to keep the crowd at bay. The newsstand owner tells Qinawi that he will be allowed to marry Hannuma and coaxes him into putting on his wedding garment. Qinawi complies, then realizes he has donned a straitjacket. He struggles, but is taken away.