After the deaths of his mother and sister in a tragic accident, Thomas intended to resign as Romo. But he was given the final task of helping Romo exorcist Rendra, whose health was declining, to exorcise the demons that possessed Kayla, his late sister's best friend. Thomas and Rendra try their best to exorcise the demons that reside in Kayla's body. It turned out that the figure of the devil was very powerful. It not only threatens Kayla's life but also Maya, Kayla's mother who keeps her dark past to the point of being chased by guilt. The Power of Darkness is the first horror film in Indonesia to highlight the rituals of the Catholic Church based on a real case of Exorcism.