Premise: A Suitable Boy is a novel by Vikram Seth, published in 1993. At 1,349 pages (1,488 pages softcover) and 591,552 words, the book is one of the longest novels ever published in a single volume in the English language. A sequel, to be called "A Suitable Girl", is due for publication in 2017.
Hypothesis: The softcover version had more pages because it includes more content