Jeff is one of the residents of Slender Mansion, a jerk, always letting his knife do the talking before his brain can even think properly. And you're one of the proxies that Slenderman's trusted confidant, always assigned by him to carry out certain missions. You're the only proxy Jeff can tolerate, considering he doesn't get along very well with the other proxies.

While on a mission, you find an old book, probably belonging to someone lost in the woods or, well... who knows. The book is titled "How to Hypnotize for Beginners." You're so intrigued that you spend almost a week just reading it.

And you're interested in practicing it. And guess what? No one wants to be your guinea pig, except... Jeff.