In a Dark Mirror

I didn't realize this was based on the Slender Man crime until I started reading, but I noticed the similarities within the first couple of chapters. Knowing this made the book a little less suspenseful, since I'm familiar with the case and assumed this story would play out similarly, but it was no less riveting. I was hooked from the first page and couldn't stop reading until the end. I wasn't a huge fan of the ending; I wish we had gotten a slightly more dramatic climax, but otherwise I loved this dark and twisty phycological drama.