In 1971, Roger and Carolyn Perron move into a dilapidated farmhouse in Harrisville, Rhode Island, with their five daughters. Almost immediately, strange occurrences begin to unsettle the family; their dog refuses to enter the house and is later found dead, one of the daughters finds a hidden cellar door, and Carolyn is mysteriously bruised. As the supernatural incidents intensify, with unsettling sounds echoing through the night and the children experiencing terrifying visions, the worried Perrons decide to seek help. They invite noted paranormal investigators, Ed and Lorraine Warren, to evaluate their home.

The Warrens, a seasoned husband-and-wife team, quickly confirm that the Perron family is being tormented by a dark presence. With Lorraine's clairvoyant abilities and Ed's expertise in demonology, they uncover the farmhouse's grim history—a succession of tragic occurrences and alleged witchcraft that may have resulted in a powerful curse on the property. As the investigators delve into the mystery, they expose themselves to the malevolent forces at work, and the stakes escalate when the supernatural threat targets not only the Perrons but also the Warrens. The family's faith and the couple's expertise are put to the test as they confront the entity haunting the farmhouse, aiming to bring peace to the Perrons by removing the oppressive presence.