In 1988, young sisters Katie and Kristi are living with their mother Julie and her boyfriend Dennis in their California home. Dennis, a wedding videographer, begins to notice strange occurrences around the house that seem to coincide with Kristi's interactions with her imaginary friend, Toby. Curious and concerned, Dennis decides to set up video cameras around the house in an attempt to capture these paranormal activities on tape. His hope is to understand what is happening in their home and to ensure the safety of his family. As the cameras roll, they capture a series of eerie events and noises during the night, raising the family's anxiety and fear levels.

As the supernatural occurrences escalate, the family's relationships begin to strain under the stress of the unexplained activities. Dennis's obsession with what is being captured on the video begins to take a toll on his relationship with Julie, who remains skeptical about the paranormal explanations. Meanwhile, the bond between the sisters is tested as they navigate the terrifying reality of their situation. Their interactions with the entity, particularly Kristi's communication with her invisible friend, become increasingly disturbing. The family seeks answers and safety, but the presence in their house seems to have its own terrifying agenda.