Per Petterson

I come from a working-class family. They're the people I know and the people I love, I guess. I do not write about them for political reasons, but because, as I see it, most interesting things - social, political, emotional - take place there. It's a bottomless well for an author like me.

'Star Wars,' 'Doctor Who,' 'Forgotten Realms,' even 'Firefly' and 'The X-Files' have shared world novels and other media. I can't help but notice these settings have large shelf space in bookstores, so their publishers and authors are getting something right.