An insomniac office worker and a devil-may-care soap maker form an underground fight club that evolves into much more.
A nameless first person narrator () attends support groups in attempt to subdue his emotional state and relieve his insomniac state. When he meets Marla (), another fake attendee of support groups, his life seems to become a little more bearable. However when he associates himself with Tyler () he is dragged into an underground fight club and soap making scheme. Together the two men spiral out of control and engage in competitive rivalry for love and power.
A young man leads a pretty humdrum life assessing car crashes to determine if his automobile company should issue recalls to fix problems. He also suffers from insomnia and takes to attending group therapy sessions for people who have survived various diseases. There he meets Marla who like him attends these sessions though she is neither a victim nor a survivor. His life changes when he meets Tyler Durden on a flight home. Tyler seems to be everything that hes not and together they create a men-only group for bare-knuckle fighting. It soon becomes all the rage with fight clubs springing up across the country and the group itself becoming an anti-capitalist domestic terrorist organization. Tyler and Marla develop a relationship leaving him often on the outside of what is going on. He soon finds that the group is out of control and after a major self-revelation decides there is only one way out.