A middle-aged insomniac lives a pretty basic life except for using cancer support groups weekly to help him sleep until he meets Tyler Durden. Tyler Durden is the absolute opposite of the main character. Together they start an underground fighting club, make soap, out of human fat, to sell to rich people, wreak havoc on the city and terrorize most of everyone around them.
In a series of escalating encounters, security guard David Dunn uses his supernatural abilities to track Kevin Wendell Crumb, a disturbed man who has twenty-four personalities. Meanwhile, the shadowy presence of Elijah Price emerges as an orchestrator who holds secrets critical to both men.
Though Kevin has evidenced 23 personalities to his trusted psychiatrist, Dr. Fletcher, there remains one still submerged who is set to materialize and dominate all the others. Compelled to abduct three teenage girls led by the willful, observant Casey, Kevin reaches a war for survival among all of those contained within him — as well as everyone around him — as the walls between his compartments shatter apart.