A few years ago, Emilia Fanning (Essie Davis) and her husband were in a serious car accident, and her husband unfortunately died in the accident. After that, Emilia worked hard in the nursing home while taking care of her young son Samuel (Noah Wiseman). Without the protection of his father, Samuel was afraid of ghosts since he was a child, and in contrast, he showed extremely violent and rebellious words and deeds. Samuel, who went to school with dangerous goods, was reprimanded by the school, and Emilia had no choice but to temporarily entrust him to Aunt Claire to take care of him. One night, Samuel chose a picture book "Mr. Babadoo" that he had never seen before as a bedtime story. Because the story was too weird and scary, Emilia stopped reading, but little Samuel seemed to be possessed. He claimed that Babadoo came to the house, and the little guy's behavior became more and more deviant, and various terrible phenomena appeared one after another...