The Conjuring: The Devil Made Me Do It (2021)

In 1981, demonologists Ed and Lorraine Warren document the exorcism of 8-year-old David Glatzel, attended by his family, his older sister Debbie, her boyfriend Arne Johnson, and Father Gordon in Brookfield, Connecticut. In an attempt to save the little boy, Arne invites the demon to enter his body instead of David's. Ed witnesses the demon enter Arne just as the demon causes Ed to suffer a heart attack.

The following month, Ed wakes up at the hospital and reveals that he witnessed the demon enter Arne. After hallucinating a demonic entity attacking him, Arne murders his landlord by stabbing him 22 times. After the Warrens consider the acquittal of Michael Taylor for murder in England, his case becomes the first American murder trial where demonic possession is claimed as a defense. The Warrens discover a witch's totem in the Glatzel home, through which a satanic curse is passed. Kastner, a former priest who had studied the Disciples of the Ram cult, tells them that an occultist had intentionally left the totem, resulting in a curse on the Glatzels and David's possession.

When the Warrens receive notice that detectives from Danvers, Massachusetts found a similar totem in the death of Katie Lincoln, who was also stabbed 22 times, they travel there. The totem was found at the home of Katie's friend Jessica, who is missing. Lorraine learns through a vision that Jessica had murdered Katie while possessed before jumping to her death, which allows detectives to recover her body. She also witnesses the occultist attempting to make Arne kill himself but stops her, causing the occultist to become aware of the Warrens' presence.

A book of Stregherian witchcraft states that for the curse to be lifted, the occultist's altar must be destroyed. Ed is affected by the curse when a totem is discovered in the Warren's house; he almost stabs Lorraine but is stopped by their assistant Drew. Kastner reveals that the occultist is in fact his daughter, Isla. He had secretly raised her in violation of the requirement of clerical celibacy in the Catholic Church. As he researched the occult, Isla grew fascinated by it and became an occultist. He leads Lorraine into the tunnels underneath the house, where her altar is but Isla kills her father, then curses Ed and Arne, causing Ed to try to kill Lorraine and Arne to try and kill himself. Ed regains his senses when Lorraine reminds him of their love, and destroys the altar, saving Arne as well. Isla is killed by the demon she'd summoned after failing to complete the curse.

Ed places the cup from the altar in the Warrens' artifact room, along with the Valak painting and the Annabelle doll. Arne is convicted of manslaughter and serves a sentence of five years, marrying Debbie while in prison.