Security Guard David Dunn (Bruce Willis) miraculously survives a catastrophic train crash. Not only is he the sole survivor out of 132 passengers, he also is completely unharmed.

Comic book specialist Elijah Price (Samuel Jackson) confronts David with an incredible theory: Elijah, who has been nicknamed "Mr. Glass" due to his more than fragile bones, thinks that David has got all which he himself lacks. The two of them "seem to be linked by a curve, but sitting on opposite ends". David begins to discover the truth behind Mr. Price's assumptions. But after all, David's fate is not only to find his real place in the world. It is also about proving Elijah's theory of his own existence.