With his eighth book, Invisible, out this month from Ballantine, Andrew Grant wanted to appeal to a wide range of readers while balancing the complexities of uncertainty, surprise and action. His approach was to create a hero who “very much resonated within the time that we live in, a hero that was most suited for current times.” Protagonist Paul McGrath comes home to New York City after many years away as military intelligence officer, a career that alienated him from his pacifist father. He arrives too late for reconciliation. His father died under questionable circumstances, and the man police believed responsible walked away during the trial due to a legal technicality. In an attempt to find the truth about what happened to his father, and gain access to restricted areas within the courthouse, McGrath, whose motto is the only constant is change, takes a job as a courthouse janitor.