Katie and Micah, a young couple, move into a new home in San Diego. Katie claims that an evil presence has been haunting her since childhood, and Micah sets up a camera in their bedroom to record any paranormal activity that occurs while they sleep. The camera captures increasingly disturbing events, including violent door slamming, loud thuds, and demonic screeches. As the occurrences escalate, Katie becomes more agitated, and Micah refuses to seek help. One night, Katie is pulled out of the bedroom by an unseen force, and Micah discovers a bite mark on her back. The couple's relationship deteriorates, and they experience more terrifying events. In the end, Katie kills Micah off-screen, and the police find his body. The epilogue text states that Katie is missing. This description highlights the main plot points of the movie without revealing any spoilers. It emphasizes the tension between Katie and Micah and how their relationship changes as they face the paranormal activity in their home.

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Some movies that have similar genres and were produced around the same time as Paranormal Activity include 6 Souls, The Skin I Live In, The Skeleton Key, Cold Prey, Silent Hill, The Final Destination.

Paranormal Activity was released in theaters on September 25, 2009.