With his new novel Brazilian Psycho, author Joe Thomas completes the São Paulo Quartet, a series that evolved from his ten years living in the city. Joe tells us how living in the setting of his books gave him an insight into a tangled web of crime and corruption to create vivid and engaging fiction. He tells us how an unpublished novel with multiple strands and characters helped give him focus for the series. The two Marks also discuss narrative voice and how an author's voice develops over time, and Mr. D has some top tips for bullet journals.