Story: [As per Wikipedia since i don't want to spoil it for you]
Three weeks after the events of Split, David Dunn (Bruce Willis) works with his now adult son Joseph in using his superhuman abilities to protect people from criminals under a new alias known as "The Overseer". David learns from Joseph that Kevin Wendell Crumb (James McAvoy), who suffers from dissociative identity disorder which provides his moniker "The Horde", has a group of cheerleaders up in a warehouse. David goes to free them but encounters one of Kevin's personalities known as "The Beast," and the ensuing fight spills out into the streets. The Philadelphia police department are called leading to the eventual capture of both David and Kevin. The two are sent to a mental institution where Elijah Price (Samuel L. Jackson), Davids sworn enemy who is also known as "Mr. Glass", is being held.
Dr. Ellie Staple (Sarah Paulson) is the head doctor of the mental institution and works with patients who claim to have special powers. In order to have them suppress those thoughts, she tries to persuade them that there is no such thing as superhuman powers and that they actually have a mental illness. Meanwhile, Elijah is secretly working with Kevin to unleash "The Beast" and expose the world to the existence of superheroes. With the help of "The Beast," Elijah escapes but he is soon pursued by David, who again battles Kevin on the institutions grounds.
Ellie arrives with armed men and explains that she has spent the majority of her career preventing superheroes from exposing themselves to the world and it turns out both Ellie and the armed men are part of a secret anti-superhuman society. The men capture David and drown him in a puddle while Kevin kills Elijah after he learns that Elijah orchestrated the train crash that killed his father, the same train wreck that Elijah caused to find David. After his father died, his abusive mother began torturing him, thus leading to the creation of Kevin's multiple personalities. Eventually, Kevin is also killed by Staples men.
The cameras inside the mental institution had previously been hacked by Elijah, and the footage is released to the world, exposing the existence of those with superhuman abilities. Ellie is shocked that the public is now aware of superheroes, which she fought to hide, and her plans and that of the secret society are destroyed. The movie ends with a shot of Philadelphia and Mrs. Price tells Joseph and Casey Cooke "it is the beginning of a universe".
Compared to Unbreakable and Split this Glass is half filled and half empty. Which concludes the trilogy but will not be ever considered to be the conclusion which people were expecting it to be.
i would give it 2.5 stars out of 5.