In 1957, a residential school in France is experiencing issues. Due to the demon Valek’s return to power, Teacher Kate and Maurice, who previously had an encounter with the terrifying demonic force, are again being frightened by the vicious Nun. The Catholic Church has tasked Sister Irene, who has previously engaged in combat with Valek, with investigating the claims of his reappearance. In order to understand how The Nun’s return is even conceivable, she teams up with Sister Debra, a new member of the organization, and the two of them head out to search for signs of Valek’s existence and discover about her new mayhem causing mission. Violence immediately breaks out as Valek reclaims her position of control and starts prowling the shadows and killing people in search of a long lost item that would allow her permanent residence, despite the fact that it’s hard to receive any answers.