Nico Baldwin is a mixed martial artist on the cusp of stardom who hides his concussions from his girlfriend and his coach. He's also hiding a deeper psychological wound, born from a childhood trauma in a New York City park. After a particularly violent fight, Nico’s concussion symptoms accelerate—insomnia, intrusive thoughts, and visions of figures lurking outside his luxury Manhattan apartment become the norm. Nico's relationship with his girlfriend implodes under the weight of his paranoia, spurring a crisis of masculinity. As his mask of sanity slips, Nico accepts a bout with The Prince, a dangerous Welsh middleweight, risking his health and maybe his life.