The devil's in the details. The way I view my job is to bring the reader into a world they otherwise could not enter and let them see it through the character's eyes. And you can only do that with detail. The details make the characters distinct from one another. If you can give them those little grace notes, those little touches, that's what makes the reader relate.

I'm a jazz guy and a Bruce Springsteen guy. So I wanted something more current, and edgier, and angrier. So I asked my kid to educate me about hip hop; he has an encyclopedic knowledge of it. And he did so. I found it to be much richer than I would've thought. I think some of the poetry in it is really spectacular. I threw rap into the book. I think I mentioned Kendrick Lamar. I'm really into Tupac these days. I love Nas, N.W.A.

American cops didn't create that atmosphere, they're the ones though who have to live with it on a daily basis. These are generalisations; you can't make generalisations about hundreds of thousands of people. The New York Police Department, for instance, has 38,000 police officers in it. But most cops, when I talk to them, desperately care about the victims of gun violence. They see it, they experience it.

The Americans take a product that literally grows on trees and turn it into a valuable commodity. Without them, cocaine and marijuana would be like oranges, and instead of making billions smuggling it, I’d be making pennies doing stoop labor in some California field, picking it.

I try to pay attention to language. I think that as a general rule, we as writers talk too much and we should listen more. I read my dialogue out loud to myself because I think that's when you catch the wrong notes and the wrong tones.

I think people will be surprised at some of the things about the shootings by policemen of unarmed African-American men. But I also think it's a balanced view. Balance has become almost a dirty word these days. It seems we're supposed to pick one side or the other. But these issues are extremely complicated. I think people will be surprised at some of that.

Shane Salerno and I adapted my book Savages together, and I learned a lot about adaptation. I think it's an extremely difficult thing to do; adaptation might even be more difficult than writing an original screenplay. It's so much a matter of choices, making choices of what to leave in. It was an education.