I watched The Reluctant Fundamentalist on BBC 2 recently. Mohsin Hamid was screenwriter and author, and the role of the narrator in the book Change[z] is much the same, but the plotting is slightly different. In particular, Changez's exotic girlfriend, Erica, in the book is given a backstory. Changez, in his doomed love affair, mirrors her doomed love affair. It's a short novel. Very few films are better than the book. Ben Hur is an example...