Set in November 2011, Paranormal Activity 4 centers on Alex Nelson and her family in a neighborhood in Henderson, Nevada.
The family starts to experience hauntings, concerning Nelson's adopted brother, Wyatt (Hunter from Paranormal 2), after Katie and her son, Robbie, come to live across the street.
The situation gets worse when Robbie comes to stay with Alex's family when his mother is in the hospital. Alex's boyfriend, Ben, helps her to film the activity via MacBook, an iPhone camera, and Kinect technology.
Robbie also has an imaginary friend named Tobi -a familiar name to those who have watched the earlier movies. While staying at the Nelsons, he introduces Wyatt to Tobi.
With Alex and her dad, Doug, out to dinner one night, Katie returns to the house. Alex's mom, Holly, is killed after being slammed against the ceiling by an unseen force. When Ben arrives, Katie snaps his neck.
Returning home, the father and daughter see Katie leading Wyatt to her house, prompting Doug to follow them.
Soon, Alex finds Ben's body in her house and runs across the street to find her father, only to see him being dragged away and killed. She continues to search for her little brother, Wyatt.
Escaping through a window, she finds her brother with many women donning the triangle around their necks. As she turns to run, she is knocked over by demonic Katie and the footage cuts out.
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