Set in 1956 France, The Nun II follows Sister Irene (Taissa Farmiga) as she confronts the return of the demonic Valak, who is murdering priests and searching for a powerful relic: the eyes of St. Lucy. Possessing Irene's friend Maurice ("Frenchie"), Valak wreaks havoc at a boarding school, where Irene and novice Sister Debra ultimately confront it, using faith to turn holy relics against the demon.