M. Night Shyamalan directs this psychological thriller starring James McAvoy. Kevin (McAvoy) is a man who suffers from dissociative identity disorder, meaning that he exhibits numerous distinct personalities which affect his behaviour.

Kevin becomes driven to kidnap three young girls - Casey (Anya Taylor-Joy), Claire (Haley Lu Richardson) and Marcia (Jessica Sula) - on their way to a party. While trapped, the girls witness Kevin's personality shift repeatedly and try desperately to figure out a way to escape. Kevin has therapy sessions with Dr Fletcher (Betty Buckley), who slowly realises that Kevin is on the verge of a devastating mental breakdown.

As she tries to convince her colleagues that someone with as serious a condition as Kevin can forcibly alter their physiology with their mind, Kevin develops a final, monstrous personality...

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