Whitney, a social media influencer, moves back to her hometown in Boston to start a new chapter in her life. She has a blossoming career and an attractive next-door neighbor, Mike, but Whitney's sister is suspicious of Mike's erratic behavior. When someone tries to sabotage Whitney's career and her sister suddenly goes missing, Whitney must determine if Mike is truly the man she's falling for, or if he's hiding a dark secret.

In a small town in Massachusetts, four high school girls perform a ritual in an attempt to debunk the lore of Slender Man. When one of the girls goes mysteriously missing, they begin to suspect that she is, in fact, his latest victim.