As the Booker prize-winning author prepares to publish his final novel at 80, we assess his finest work As the Booker prize-winning author prepares to publish his final novel at 80, we assess his finest work Duffy is the first in a series of crime novels about a bisexual private eye that Barnes published under the pseudonym Dan Kavanagh. It came out the same year as Barnes’s debut novel proper, Metroland, but where that took seven years to write, this took 10 days. Not that it shows: this “