Donnelly (played by Brendan Gleeson) is experiencing a difficult time. Following his wife's passing, he's on the train heading home when he encounters a young boy (Rúaidhri Conroy) who isn't shy about speaking his mind—what my grandmother would have called exceptionally unusual. The boy directs his remarks toward a couple who join the train later and seem visibly upset. It becomes clear that the woman (Aisling O’Sull…