In “Slenderman,” writer Kathleen Hale chronicles the stranger-than-fiction case of two 12-year-old girls in Wisconsin who stabbed their friend in the woods in 2014 because they were under the sway of Slenderman, a fictional demon they found on the Internet. Hale spent seven years researching the case and gives a step-by-step account how of the friendship between two girls spiraled into a shared delusion. In her review, The Associated Press' Mae Anderson says Hale’s compassionate look at the case is a compelling yet harrowing read that reveals how a seemingly innocent childhood friendship could lead to such a devastating outcome.