Londonstani by Gautam Malkani. It's got one of those fashionable plot twists close to the end. The problem with that was if you had managed to like the book up until then, which I had, despite it not being the easiest read, the plot twist invalidated everything you'd previously liked about the book.

For the sake of being smartarsed, spoil your story. No wonder it's less popular than the publishers hoped.