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.

Desperate to find their missing friend, a group of girls summons the entity they believe took her -- the evil legend of Internet lore, Slender Man.