On a morning in early-1986 in Arizona, someone sat hunched over a desk, furiously writing a letter. And almost every line of this letter included a direct threat of violence this person was going to inflict on the recipient. They kept writing, embellishing every horrible thing that they wanted to do. Finally, they finished writing and read over the letter—it was explicit and terrifying, just as they’d hoped. They put the letter down, glanced at a cardboard box sitting on the floor, and smiled. Nobody would ever suspect that the contents of that plain box would soon help them carry out the bizarre murder plot they’d had running through their head for months.