A split third person narrative; One describes the architects that built the 1894 world fair in Chicago, and another that follows the escapades of one of history’s most notorious serial killers, HH Holmes, that prayed on the women that went to the fair.
One of my favorite books I’ve ever read.
Faraday bag all electronic items; phone, smartwatch; hell, I’d even bag my car keys. Cover your face, especially the eye area. Make your voice heard, but don’t be a data point.