What happens when a battle-tested boy, an isolated physician, a naked and sedated alpha zombie and a gang of miscreants encounter one another for the second part of an inventive film trilogy in a long-running series? It’s bloody interesting, when that film installment is Nia DaCosta’s 28 Years Later: The Bone Temple (B). Ralph Fiennes’ kindly physician character takes center stage, and his “bone temple” memorial to lost lives in an uncertain future becomes a veritable amphitheater for this movie’s showdown with some unlikely villains. This film amps up the gore, brutality and existential dread about true evil in the world, and Fiennes anchors the film with grace notes of humanity mixed with a hint of the unhinged. As the teen who came of age in the previous installment, Alfie Williams is again wonderfully emotive but a little sidelined in a majority of the story. Jack O’Connell is dynamite as a menacing leader of a band of renegades including an effective Erin Kellyman. Even Chi Lewis-Parry brings humanity to his hulking infected character. This latest trilogy upends many of the tropes of the undead genre, with conversation and contemplation featured more often than straightforward action. It’s still very engrossing, even if the myth-making in Danny Boyle’s previous movie was more revelatory than the religious angles of DaCosta’s. This is a delightful and delicate mash-up of genres and one of the most offbeat Hollywood tentpole films to be released in some time. Again, it’s exciting and insightful.