Patrick Harbron/HuluAfter three seasons of Only Murders in the Building, certain aspects of the show have become all too predictable. For example, in the finale, a killer will inevitably be revealed—but there will be a twist in the story that reveals another side unseen to podcasters Mabel (Selena Gomez), Charles (Steve Martin), and Oliver (Martin Short). Then, when the murderers have been escorted away in handcuffs, someone new will die. What remains unpredictable, however, is the whodunit, how