The book exposes the changes in Indian society from independence in 1947 to the Emergency called by Indian Prime Minister Indira Gandhi. Mistry was generally critical of Gandhi in the book. Gandhi, however, is never referred to by name by any of the characters, and is instead called simply "the Prime Minister". The characters, from diverse backgrounds, are brought together by economic forces changing India.
Ishvar and Omprakash's family is part of the Chamaar caste, who traditionally cured leather and were considered untouchable. In an attempt to break away from the restrictive caste system, Ishvar's father apprentices his sons Ishvar and Narayan to a Muslim tailor, Ashraf Chacha, in a nearby town, and so they became tailors. As a result of their skills, which are also passed on to Narayan's son Omprakash (Om), Ishvar and Om move to Bombay to get work, by then unavailable in the town near their village because a pre-made clothing shop has opened.
A powerful upper-caste village thug, Thakur Dharamsi, later has his henchmen murder Narayan and his family for having the temerity to ask for a ballot. Ishvar and Omprakash are the only two who escape the killing as they lodged with Ashraf in the nearby town.
At the beginning of the book, the two tailors, Ishvar and Omprakash, are on their way to the flat of widow Dina Dalal via a train. While on the train, they meet a college student named Maneck Kohlah, who coincidentally is also on his way to the flat of Dina Dalal to be a boarder. Maneck, from a small mountain village in northern India, moves to the city to acquire a college certificate "as a back-up" in case his father's soft drink business is no longer able to compete after the building of a highway near their village. Maneck and the two tailors become friends and go to Dina's flat together. Dina hires Ishvar and Om for piecework, and is happy to let Maneck stay with her.
Dina, from a traditionally wealthy Parsi family, maintains tenuous independence from her brother by living in the flat of her deceased husband, who was a chemist.
Dina grew up in a wealthy family. Her father was a medical doctor who died when she was twelve. Her mother was withdrawn and unable to take care of Dina after her father's death, so the job fell to Nusswan, Dina's elder brother. Nusswan was rather abusive to Dina, forcing her to do all the cooking, cleaning, and drop out of school, and hitting her when she went against his wishes. Dina rebelled against Nusswan and his prospective suitors for her when she came of age, and found her own husband, Rustom Dalal, a chemist, at a concert hall. Nusswan and his wife Ruby were happy to let her marry Rustom and move to his flat.
Dina and Rustom lived happily for three years until Rustom died on their third wedding anniversary, after being hit by a car while on his bicycle. Dina became a tailor under the guidance of Rustom's surrogate parents to avoid having to move in with Nusswan. After twenty years her eyesight gave out from complicated embroidery and she was once again jobless. She eventually met a lady from a company called Au Revoir Exports - Mrs Gupta - who would buy ready-made dresses in patterns. She agrees to let Dina sew the patterns. But since Dina has very poor eyesight, she decides to hire tailors. She also decides to have a paying guest to generate more income for her rent.
The tailors rent their own sewing machines, and come to Dina's flat each day for nearly two weeks before the first round of dresses is completed. The three get along fairly well, but Dina and Omprakash do not see eye to eye all the time. Omprakash is angry that Dina is a middle-person; he wants to sew for Au Revoir directly.
Maneck was born in a mountain town to loving parents, Mr and Mrs Kohlah. His father owned a grocery store that had been in the family for generations. The store sold household necessities and manufactured the locally popular soda, Kohlah Cola. Maneck spent his days going to school, helping at the store, and going on walks with his father. When he was in the fourth standard, Maneck was sent to boarding school to help his education, much to his dismay. After this, his relationship with his parents deteriorates because he does not wish to be separated from them and feels betrayed. His parents send him to a college and choose his major, refrigeration and air-conditioning.
Maneck goes to college and stays at the student hostel. Maneck becomes friends with his neighbor, Avinash, who is also the student president and who teaches him how to get rid of vermin in his room. Avinash also teaches Maneck chess and they play together often. Avinash later becomes involved in political events, for which Maneck has little interest, and their friendship is no longer a priority for Avinash. They start seeing each other quite infrequently. But when the Emergency is declared in India, political activists had to go into hiding in order to be safe, Avinash included. Maneck, after a humiliating ragging session by fellow hostel students, has his mother arrange a different living situation for him, and he moves in with Dina Dalal.
Dina and the tailors' business runs fairly smoothly for almost a year, but effects of the Emergency bother them often. The shantytown where the tailors live is knocked down in a government "beautification" program, and the residents are uncompensated and forced to move into the streets. Later Ishvar and Om are rounded up by a police beggar raid and are sold to a labor camp. After two months in the camp, they bribe their way out with the help of the Beggarmaster, a kind of pimp for beggars. Ishvar and Om are lucky and Dina decides to let them stay with her. The tailors and Dina find trouble from the landlord, because she is not supposed to be running a business from her flat. She pretends that Ishvar is her husband and Om their son and also gets protection from the Beggarmaster.
Ishvar and Om return to their village to find a wife for Omprakash, who is now eighteen. Maneck returns home, finished with his first year in college (he has received a certificate but not a degree), but has stiff relations with his family and finds that his father's business is failing due to the invasion of cheap commercial sodas. He takes a lucrative job in Middle Eastern Dubai to escape the conditions.
Dina being alone now, and her protector the Beggarmaster having been murdered, has no protection from the landlord who wants to break her apartment's rent control and charge more rent, so she is evicted. Dina is forced to move back to her brother Nusswan's house.
Omprakash and Ishvar return to their old town to find that Ashraf Chacha is an elderly man whose wife died and daughters were all married off. He gives them a place to stay while they search for marriage prospects for Om. While they walk around the village, they run into the upper-caste Thakur Dharamsi. Omprakash recognizes him and spits in his direction. Thakur in turn recognizes Om, and decides to somehow pay Om back for his disrespect of an upper caste member. When Ashraf Chacha, Ishvar, and Om are in the village, they run into herders from the Family Planning Centre. As the Centre in this city did not fill its quota, they took random people from the street and forced them into a truck that drove them to the Family Planning Centre. All three are beaten into the truck and since Ashraf Chacha is so old, he is gravely injured and later dies on the street. Ishvar and Omprakash beg to escape the forced sterilization, but the vasectomy takes place. As they lie in an outside tent recovering, Thakur Dharamsi comes by and coerced the doctor to give Om a castration. Ishvar's legs become infected due to the vasectomy and must be amputated. However, Ishvar and Om have nowhere to go now that Ashraf Chacha has died. His son-in-law sells his house and they are forced to leave town.
Eight years later, Maneck returns home for the second time from Dubai for his father's funeral. Maneck is repulsed by the violence that follows after the Prime Minister's assassination, for which Sikhs are killed. He returns home and attends the funeral, but cannot bring himself to truly miss his father, only the father of his young childhood.
While at home he reads old newspapers and learns that Avinash's three sisters have hung themselves, unable to bear their parents' humiliation at not being able to provide dowries for their marriages. Shocked and shaken, he decides to visit Dina in Bombay for better news. He learns from Dina the horrific lives that Ishvar and Om– one disabled and the other castrated – have led as beggars after their village visit. As Maneck leaves, he encounters Om and Ishvar on the street. The two former tailors are nearly unrecognizable because of their filth, and don't appear to recall him. They say "Salaam" to him, but he doesn't know what to say and walks on.
Maneck goes to the train station, his world shattered. He walks out on the tracks as an express train approaches the station and commits suicide by letting the train run over him.
It turns out that Om and Ishvar were on their way to visit Dina. They are still friends, and she gives them meals and money when the house is empty. Dina and the beggars discuss their lives and how Maneck has changed from a pleasant and friendly college student to a distant refrigeration specialist. Om and Ishvar leave, promising to visit after the weekend. Dina washes up their plates, and returns the plates to the cupboard, where they are to be used later by Nusswan and Ruby.
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