Split is released in February 2017, original writer and director M. Night Shyamalan, tells the story of Kevin (James McAvoy), a patient of the psychiatrist Karen Fletcher (Betty Buckley) who suffers from dissociative identity disorder or multiple personality , the doctor has documented twenty-three personalities that live in it.

"Denis" is one of these personalities, kidnaps three girls and keeps them locked in a basement under the care of "Patricia" and "Hedwig" a mysterious woman and a nine-year-old boy, who surprisingly for young girls is the same person Your kidnapper acts differently each time you visit them. Scared and confused, with the passing of days they understand the disorder that their captor presents.

The personalities of Denis, Patricia and Hedwig call themselves "the Orda", and kidnap the adolescents in order to perform a kind of sacrifice or ritual where they will liberate a new identity they call "The Beast".

The real Kevin has been hiding for several years among the personalities that coexist within him, submitted by which "comes to light" term used to refer to the control of his body. The Beast would be the 24th individual that originates in him and the darkest one, when Kevin develops this identity he does it inspired by the characteristics of the animals of the zoo.

It manifests unique physical conditions for each personality, a cognitive and physiological prism within a single body, woman, child, man and beast in the same organism that functions differently for each identity. Without Dr. Fletcher knows The Beast comes to light, becoming a supernatural killer, which can not cross the bullets, achieved superhuman strength and incredible speed.

The story is well worked, and keeps the viewer intrigued until the last moment, it is confusing and requires a lot of attention to understand the background of the message. The work of the actor is admirable considering that there are twenty-five characters for the same movie, it has been a controversial film because some patients with this disorder have expressed feeling offended by the unorthodox way as the writer and director addressed this delicate issue.