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Casey (Anya Taylor-Joy) (played by Jessica Sula) is a strange girl who seems to be out of place with her peers. One day / she and her classmates Claire (Haley Lu Richardson) and Marcia (Jessica Sula) were preparing to take a car home. Unexpectedly / they were attacked and kidnapped by a mysterious man. The three were imprisoned in a dark and cold basement / facing an unknown and dangerous fate. The kidnapper of the three girls was a man named Kevin (played by James McAvoy). In fact / he was a multiple personality patient / with as many as 23 personalities that dominated his body. Fletcher (played by Betty Buckley) is Kevin's attending doctor. She discovers that there are differences between Kevin's personalities. What's worse is that a 24th personality is slowly forming. This personality is strong / evil / and cruel. Once he gains dominance over Kevin's body / not only will the three girls suffer / but even Kevin himself will lose his life.
凯西（安雅·泰勒-乔伊 Anya Taylor-Joy 饰）是一个显得和同龄人格格不入的怪女孩，某日，她和同学克莱尔（海莉·路·理查森 Haley Lu Richardson 饰）、玛西亚（杰西卡·苏拉 Jessica Sula 饰）一起准备坐车回家，哪知道遭到了一神秘男子的袭击和绑架，三人被囚禁在灰暗阴冷的地下室中，面临着未知的凶险命运。 绑架三个女孩的，是一个名叫凯文（詹姆斯·麦卡沃伊 Jam
