'A compelling yet harrowing read' Daily Mail
'One of the best true crime books of the year' CrimeReads

The 2014 Slenderman stabbings in Wisconsin, USA, shocked the local community and the world. The violence of Morgan Geyser and Anissa Weiser, the two twelve-year-old girls who attempted to stab their classmate to death, was extreme, but what seemed even more frightening was that they had done so under the influence of an internet meme, the so-called 'Slenderman'.

Slenderman tells the full story for the very first time. Morgan and Anissa's friendship could so easily not have taken the turn it did - but Morgan was suffering with early onset schizophrenia. She believed she had been seeing Slenderman for years, and that the only way to stop him killing her family was to bring him a sacrifice. Her victim miraculously survived the attack but was left deeply traumatised, while the severity of their crime meant Morgan and Anissa would be tried as adults.

Slenderman is both a page-turning true crime classic and a compelling search for justice.

"A compelling yet harrowing read that reveals how a seemingly innocent childhood friendship could lead to such a devastating outcome." - Daily Mail

"One of the best true crime books of the year" - Crimereads

"Book of the week" - People magazine

"[Of the author's earlier work Kathleen Hale is a Crazy Stalker] Reminiscent of David Foster Wallace and Jon Ronson" - Jesse Eisenberg

"Kathleen Hale's Slenderman is a haunting, powerful, accomplished and necessary book that is impossible to put down" - Sonia Faleiro, author of The Good Girls