Director Danny Boyle won’t be the only person in raptures at the board-sweeping success of Slumdog Millionaire at the Oscars last night: Vikas Swarup, author of the book on which the film is based, is also likely to be rubbing his hands together in glee.Swarup’s Q&A, the colourful tale of how an 18-year-old boy from the slums manages to win one billion rupees on a television game show, was ticking along at a perfectly average rate before Boyle filmed it for the big screen as Slumdog Millionaire, selling some 35,000 copies since publication three years ago, according to book sales monitor Nielsen BookScan.But the film’s initial success at the Golden Globes in January, coupled with pre-Oscar buzz, means the novel has sold the same amount of copies in the last month-and-a-half, according to the Bookseller, which reports that the paperback film tie-in edition has sold 35,666 copies since it was published on 2 January this year.