Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
Third Person (Omniscient)
No fancy tricks here: this is historical non-fiction, not magical realism.
Our narrator is likely author Erik Larson, recreating for us the events that unfolded in Chicago before the turn of the century. We're permitted to enter inside the minds of pretty much everyone: Burnham, Holmes, fair-goers, murder victims, and at times the entire city of Chicago.