Never leave a guy home alone. If you expect that, after a tender goodbye, he will slip on his slippers and sit down with a book under the blanket, you will be sharply disappointed.

Boris 'Kos' Kosinski is a top MMA fighter. In the biggest battle of his life with his greatest rival, Denim Takaev, he makes a mistake that destroys his entire career. He loses everything. This failure brings him through a series of ups and downs, but it...