"The first full account of the Slenderman stabbing, a true crime narrative of mental illness, the American judicial system, the trials of adolescence, and the power of the internet. On May 31, 2014, in the Milwaukee suburb of Waukesha, Wisconsin, two twelve-year-old girls attempted to stab their classmate to death. Morgan Geyser and Anissa Weier's violence was extreme, but what seemed even more frightening was that they committed their crime under...