M. Night Shyamalan is back to his old form with his new psychological horror film “Split,” his first No. 1 movie in more than 10 years.

“Split” follows a man (James McAvoy) with dissociative identity disorder and 23 different personalities, as he goes on to kidnap three girls. It is a thematic sequel to Shyamalan’s 2000 film “Unbreakable.”

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