Having written more than 40 books, Anthony Horowitz wanted to do something different with his Susan Ryeland series. “It’s my attempt to do completely new things in the murder mystery genre,” he says.

What he wrote is a novel within a novel, in which the crime writer of the first novel is murdered and the hero of the second novel finds out whodunnit. The first novel is set in the Fifties, the second in the present. Still with me?