The first thing I remember is the sound of sirens folding over each other like metal tearing in the wind.

I was driving south on Interstate 15 after a late shift in downtown Salt Lake City, keeping one hand on the wheel while the other wrapped around a paper cup of gas station coffee that had gone cold twenty minutes earlier. The sky was already black and the highway remained slick with old snowmelt, causing every set of headlights behind me to look stretched and blurry in my rearview mirror.