The story of how a desperate loner who has grown up with a butterfly and the Bible for company one day seizes his chance and makes good his escape, only to face his worst fears head-on at an all-nighter in the company of strangers. Based on H. P. Lovecraft's weird tale of the same name.

In the heart of the most notorious correctional facility, Black Hills, the walls echo with more than just despair-they tremble with the sounds of illegal fight matches. Inmates are pitted against each other by guards, who stream the brutal brawls.