Five years after the disappearance of Katie and Hunter, a suburban family witnesses strange events in their neighborhood when a woman and a mysterious child move in. The family's teenage daughter, Alex, and her boyfriend Ben begin to notice the peculiar behavior of Robbie, the boy from across the street who starts visiting their home after his mother is taken to the hospital. Equipped with laptops and handheld cameras, Alex and Ben start documenting these occurrences which appear to escalate in intensity and strangeness, particularly around Alex's younger brother, Wyatt.

As the eerie events continue to unfold, Alex's family becomes increasingly entangled in the web of paranormal activity. The interactions between Wyatt and Robbie grow more concerning, with Robbie introducing Wyatt to an invisible friend named Toby and teaching him strange symbols. Alex's attempts to convince her parents of the unsettling phenomena around them are met with skepticism, leaving her and Ben to investigate further on their own. They find that their home's security cameras capture far more than just the mundane activities of daily life, leading them to realize the true extent of the malevolent presence around them.