In August 2006, a “burglary” occurs at the home of Kristi (Sprague Grayden) and Daniel Rey (Brian Boland), trashing their house and leaving only their infant son Hunter’s bedroom untouched. The only thing stolen is a necklace that Kristi’s sister, Katie, gave to her. Martine, the Latin American family housekeeper and nanny, senses “evil spirits” in the house and burns sage to rid of them, Daniel fires her for doing so. Kristi also believes that their home is haunted, and she and Katie talk about being tormented by a demon when they were children. Daniel, however, initially dismisses her claim despite seeing the footage.Paranormal Activity 2 2010 .
Daniel’s daughter from a prior marriage, Ali (Molly Ephraim), begins investigating the mysterious happenings; she discovers that humans can make deals with demons for wealth or power by forfeiting the soul of their first-born son, but if the deal is not fulfilled, the demon will stick to the family until another son is born—Hunter was the first male to be born on Kristi’s side since the 1930s.
The violence escalates, as the family’s German shepherd, Abby, is attacked by the demon and apparently suffers from a seizure. As Daniel and Ali take Abby to the veterinarian, Kristi is attacked and dragged into the basement by the demon, possessing her. The following day, Ali is left home with Kristi, unaware she is possessed. Soon, Ali hears a scratch sound in the basement door and opens it to find scratches and sees a word, meus (Latin for “Mine”), etched into it. A strange bite mark on her leg and the footage of Kristi’s attack motivates Daniel to re-hire Martine, who prepares a cross to exorcise the demon; Kristi will have no memory of having been possessed. Daniel goes to pass the demon onto Katie so that Kristi and Hunter will be saved, despite Ali’s pleas not to.