The Conjuring: Last Rites is about paranormal investigators Ed and Lorraine Warren coming out of semi-retirement to investigate the haunting of the Smurl family in Pennsylvania in 1986. The story begins in 1964 with the Warrens encountering a cursed antique mirror that causes supernatural terror and leads to the birth of their daughter, Judy. Years later, the Smurl family faces terrifying attacks linked to the mirror. The Warrens and Judy, who has psychic abilities, work together to confront and destroy the demonic presence connected to the mirror, while also exploring themes of family, legacy, and embracing one's supernatural gifts. The film is based on the true Smurl haunting case and is part of The Conjuring Universe, focusing on the Warrens' final investigation and passing the torch to the next generation.