Adapting a work of literature into a movie is an arduous task. Satyajit Ray's 'Apu Trilogy' [PATHER PANCHALI, APARAJITO and APUR SANSAR] was based on two Bengali novels written by Bibhuthibhushan Bandopadhyay. Ray's SHATRANJ KE KHILADI was based on Munshi Premchand's short story of the same name. In fact, film-makers have always been fascinated by best-selling books/novels for adapting into feature films. Mira Nair's THE NAMESAKE, P.C. Barua, Bimal Roy and Sanjay Leela Bhansali's DEVDAS, Pradeep Sarkar's PARINEETA, Rajkumar Hirani's 3 IDIOTS, Atul Agnihotri's HELLO and the recent AISHA have been adapted from literary works. Even in Hollywood, LORD OF THE RINGS, HARRY POTTER, NARNIA and many more have been successfully adapted from novels by reputed names.
However, if you analyze the past, you will realize that not all movies adapted from novels/short stories have set the cash registers jingling at the box-office. Films like PINJAR, PAHELI, RAINCOAT and international experiments like BRIDE AND PREJUDICE and THE MISTRESS OF SPICES have found very few takers in the past.
This is not the first time Ashutosh Gowariker has adapted a book into a film. KHELEIN HUM JEE JAAN SEY is yet another book-to-movie adaptation by this talented storyteller [this one is based on the book 'Do And Die: The Chittagong Uprising 1930-34' by Manini Chatterjee]. Again, this is not the first time Ashutosh Gowariker has revisited the bygone era. He did it successfully in LAGAAN [period], then JODHAA AKBAR [historical] and now KHELEIN HUM JEE JAAN SEY [period].