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M Night Shyamalan is back in business with this creepy psychological horror. It begins with the abduction of three teenage girls - BFFs Claire (Haley Lu Richardson) and Marcia (Jessica Sula), plus loner Casey (The Witch's Anya Taylor-Joy). They wake up in the underground lair of one Kevin Crumb (James McAvoy), a man whose struggles with dissociative identity disorder are about to take a profoundly unsettling turn. Despite the best efforts of his psychiatrist (Betty Buckley), the most unstable of Kevin's 23 personalities are now firmly running the show. And what they've got planned isn't for the faint-hearted. Something wicked this way comes...