Nicholas Lemann sits down with Emily Witt, author of the new book Nollywood: The Making of a Film Empire. Amid electricity cuts, fuel scarcity, and countless other obstacles, Nigerians are pursuing the very real possibility that Nollywood dramas could become a global brand, as recognizable as the Bollywood musical, the Hong Kong kung fu flick, or the Hollywood blockbuster. How did Nigeria create the second largest movie industry in the world?