Celebrated as an author of travel and fiction, Tahir Shah has published more than forty books in a career that's spanned three decades. In that time he's turned his hand to many kinds of writing - from journalism to novels, and from travelogues to cultural research. Until now he has never published work written for the screen. 'I'm a believer that if you're a writer you have a duty to experiment, ' he says, 'in the same way an artist...