Alina returns to Romania from Germany to be reunited with her childhood friend, Voichita, at an isolated Orthodox convent. Alina expects Voichita to leave with her, but Voichita has found solace and purpose in her monastic life, creating a tension between her religious devotion and their deep bond. Alina struggles to accept Voichita's decision, leading to increasingly erratic behavior that alarms the nuns and the priest. They attempt to integrate her into the convent's life, but find that her presence disrupts the community's strict, ascetic harmony.

As Alina's emotional turmoil escalates, the convent's authority figures become convinced that she is possessed by malevolent forces. The priest, with the nuns' assistance, resorts to extreme measures in an attempt to cure her, isolating her from the outside world. Their actions are driven by a mix of fear, faith, and misunderstanding, showing the stark clash between religious zeal and modernity. The situation spirals out of control, testing the limits of friendship and faith in an environment where the line between good intentions and harmful consequences blurs inexorably.