I think that's true of real life - we don't ever know anyone completely. Secrets are very important to creating a narrative work that's believable. The characters come into that world with secrets, as happens to all of us. As honest as we try to be in our relationships, we can never completely know someone. From a narrative perspective it's very important and pleasing - you want to have those secrets there. The secret is an essential part of the creation of the novel.

What I strive to do is make my characters seem like real people so that the reader experiences them as people - that's something I've been working on all of my life. I couldn't have written this novel at twenty or thirty, for technical reasons - I didn't have the technique then - but above all because I didn't have the life experiences I have now at sixty-seven.

For someone like you who's a British citizen this might seem strange. How can you ban a language? It turns out that you can. During the dictatorship it was illegal to speak Catalan. This is an experience that we Catalans have all had to varying extents. Some more tense than others, but it's something we all share.

Research is necessary. However, you need to make sure you don't fall into its trap. You need to have time left for writing. To avoid the trap, I just throw myself into the abyss while at the same time being aware that if I'm dealing with information I don't know enough about, I have to go to someone and talk about it.

I'm interested in how memory and power come together in evil. These are obsessions of mine that appear throughout, like the theme of music. I know at some point or another one of my obsessions will emerge. You don't know how much I save in psychiatrist bills with this writing!

Along the way, about certain things, you realize, "I don't know anything about this." You think, "Is this going to sound ridiculous?" So I pestered more than a hundred different people over the course of the book. And when I finished the book I gave it to six or seven trusted readers, who are always the same, but I also gave it to a brother of mine who's a doctor and I asked him to read it, and he was very helpful. It's good to have a group of trusted readers. As my kids have grown up, they've joined this group.

I'm always reading, and you learn a lot by reading. When I was twenty-five, I read a lot, but didn't have much reading behind me.