Question: What novel sequence by the husband of Eveline Hańska is generally viewed as his "magnum opus"?

Context articles: Magnum opus (alchemy)
Qurratulain Hyder
Timelike Infinity
The Amazing Adventures of Kavalier &amp; Clay
Ewelina Hańska
Jean Gigoux
Daisy Buchanan
Woes of the True Policeman
The Golovlyov Family
Honoré de Balzac

The Great Work (Latin: Magnum opus) is an alchemical term for the process of working with the prima materia to create the philosopher's stone.
 It has been used to describe personal and spiritual transmutation in the Hermetic tradition, attached to laboratory processes and chemical color changes, used as a model for the individuation process, and as a device in art and literature.
 The magnum opus has been carried forward in New Age and neo-Hermetic movements which sometimes attached new symbolism and significance to the processes.
 It originally had four stages:
Qurratulain Hyder (20 January 1927 – 21 August 2007) was an influential Indian Urdu novelist and short story writer, an academic, and a journalist.
 One of the most outstanding literary names in Urdu literature, she is best known for her magnum opus, "Aag Ka Darya" (River of Fire), a novel first published in Urdu in 1959, from Lahore, Pakistan, that stretches from the 4th century BC to post partition of India.
 Popularly known as "Ainee Apa" among her friends and admirers, she was the daughter of writer and pioneers of Urdu short story writing Sajjad Haidar Yildarim (1880–1943).
 Her mother, Nazar Zahra, who wrote at first as Bint-i-Nazrul Baqar and later as Nazar Sajjad Hyder (1894–1967), was also a novelist and protegee of Muhammadi Begam and her husband Syed Mumtaz Ali, who published her first novel.
Timelike Infinity is a 1992 science fiction book by British author Stephen Baxter.
 The second book in the Xeelee Sequence, "Timelike Infinity" introduces a universe of powerful alien species and technologies which manages to maintain a realistic edge due to Baxter's physics background; it largely sets the stage for the "magnum opus" of the Xeelee Sequence, "Ring" (as opposed to "Vacuum Diagrams", "Flux", or "Raft", which concern themselves with side-stories).
The Amazing Adventures of Kavalier & Clay is a 2000 novel by Jewish American author Michael Chabon that won the Pulitzer Prize for Fiction in 2001.
 The novel follows the lives of two Jewish cousins, Czech artist Joe Kavalier and Brooklyn-born writer Sammy Clay, before, during, and after World War II.
 In the novel, Kavalier and Clay become major figures in the comics industry from its nascency into its Golden Age.
 "Kavalier & Clay" was published to "nearly unanimous praise" and became a "New York Times" Best Seller, receiving nominations for the 2000 National Book Critics Circle Award and PEN/Faulkner Award for Fiction.
 In 2006, Bret Easton Ellis declared the novel "one of the three great books of my generation," and in 2007, "The New York Review of Books" called the novel Chabon's magnum opus.
Eveline Hańska (Ewelina, née Rzewuska, 6 January c. 1805 – 11 April 1882) was a Polish noblewoman best known for her marriage to French novelist Honoré de Balzac.
 Born at the Wierzchownia estate in Volhynia, (now Ukraine) Hańska married landowner Wacław Hański (Wenceslas Hanski) when she was a teenager.
 Hański, who was about 20 years her senior, suffered from depression.
 They had five children, but only a daughter, Anna, survived.
Jean Gigoux (8 January 1806 – 11 December 1894) was a French painter and illustrator.
 He is best known as the last paramour of Eveline Hańska, the widow of French novelist Honoré de Balzac.
Daisy Fay Buchanan is a fictional character in F. Scott Fitzgerald's magnum opus "The Great Gatsby" (1925).
 In the novel, Daisy is depicted as a married woman with a daughter who is reunited with her former lover Jay Gatsby, arousing the jealousy of her husband, Tom.
 She is widely believed to have been based on Ginevra King.
 She has appeared in various media related to the novel including feature films and plays.
Woes of the True Policeman ("Los sinsabores del verdadero policía" in Spanish) is a novel written by Chilean author Roberto Bolaño and published posthumously.
 The novel was first released in Spanish in 2011.
 Larry Rohter in his review of the English translation in "the New York Times" said "The novel offers readers plot lines and characters that supplement or propose variations on Mr. Bolaño’s 900-page magnum opus, "2666"".
 An English-language translation by Natasha Wimmer was published in the US on November 13, 2012, by Farrar, Straus and Giroux.
 An editorial note appended to the book by Bolaño’s widow describes it as “a project that was begun in the 1980s and continued to be a work in progress up until the year 2003 [...] this edition was undertaken with the unwavering intent to respect Bolaño’s work and the firm pledge to offer the reader the novel as it had been found in his files.”
The Golovlyov Family (Russian: Господа Головлёвы , "Gospoda Golovlyovy " ) is a novel by Mikhail Saltykov-Shchedrin, written in the course of five years, first published in 1880 by Alexey Suvorin's publishing house, and generally regarded as the author's magnum opus.
Honoré de Balzac ( ; ] , born Honoré Balzac, 20 May 1799 – 18 August 1850) was a French novelist and playwright.
 The novel sequence "La Comédie Humaine", which presents a panorama of post-Napoleonic French life, is generally viewed as his "magnum opus".