Siri and I have been together for 30 years and have shared our work with each other from the very beginning. As I write my books I’m reading them out loud, carrying pages home, eagerly awaiting her comments. She’s brilliant. I don’t think there’s a comment she’s made that I haven’t taken to heart over those years. Conversely, I read everything she writes, in her finished draft. I think in order to do this kind of thing, number one you have to have total faith in the other person—believe in that person’s project, and be completely honest. You can’t just pat the other on the back. We do our thing separately but we share it.