Roman Coleman (Matthias Schoenaerts) is a tightly wound convict fresh out of solitary confinement at a maximum security prison in the Nevada desert. Still wary of human contact, Roman enrolls in a tough but rewarding rehabilitation program learning to train wild mustangs. Under the tutelage of grizzled trainer Myles (Bruce Dern), he takes charge of an ornery horse in the hopes of preparing it for an annual auction. With the wild animal acting as a mirror for his own raging emotions, Roman must learn to tame not only the mustang but also the beast within.