Author Scott Turow calls his latest novel, "Identical," a "weird stew of personal things."Indeed it is. The book centers around a set of twins — state Sen. Paul Giannis and his brother Cass, a recently released ex-con who served 25 years for the murder of his girlfriend. That case mirrors the unsolved case of Valerie Percy, the daughter of real-life Illinois politician Charles Percy, who was killed in her Kenilworth home in 1966. Percy, herself, was a twin, and the notorious murder happened a few miles from where Turow lived on Chicago's North Shore. Adding thematic complexity to the tale, Turow's family suffered the loss of a twin when he was 3 years old, a fact that reverberates through the book.A fixture on the best-sellers list, most notably for books such as "Presumed Innocent" and "Reversible Errors," Turow still practices law and serves as president of the Authors Guild. At 65, he has added new projects that include a young adult novel and writing for television.In this interview, Turow talks about his 10th novel, his publisher's fight with Amazon.com and what the Supreme Court gets wrong about political speech. Below is an edited excerpt of our talk, but you can listen to our entire conversation on our podcast "The Big Questions," available for free on iTunes and YouTube.Q: You've said before you are a big believer in this theory that authors write only one book. And if that is true for you, what is the theme of that book?Turow: If I understood that completely, I might be writing something different. I think I am writing about the uses and abuses of power — but that is a guess. They are just the same sort of assembly of obsessions.I am doing writing for TV now. I'm working on this young adult book. I think that's partly an effort to avoid repeating myself. But if you go into slightly different media, then your own constant hobby horses have a new way of expressing themselves.Q: "Identical" seems more thematically personal than much of your other work because it is about identical twins. You've shared that your sister had been a twin, but her fraternal twin died in childbirth. What conversations have you had with Vicki, your younger sister, about that?Turow: That is a really interesting question. And I have been trying for the last couple of years to engage her on that subject and she's extremely elusive, which she has every right to be. It finally dawned on me, about a year ago I said, "I'm doing all this talking about what the death of your twin meant to me." I said, "What did it mean to you?"And she said to me, "That's an interesting question. ... We'll have to talk about it sometime."For more, listen to the entire interview.