The books, set in Dublin and its surrounding countryside, serve as a rich look into the recent history of Ireland. From the housing crisis to widening class divides, the books, written over the last 13 years, use the country’s socioeconomic issues as a backdrop to murder cases that go deeper than a quick whodunnit. Each book features a different member of the squad as the protagonist. Previous protagonists pop up in other novels, side characters come back to visit. They’re really marvelously done and, judging by how well they’ve sold, you probably already know this.