It stars Matthias Schoenaerts as an incarcerated inmate who participates in a rehabilitation program centered around training of wild horses.

While working maintenance, Roman is seen interacting with a 'dangerous' horse and thereby placed in the rehabilitation program run by rancher Myles that assigns prisoners with training wild mustangs.

Roman initially struggles with the training of his mustang, but under the guidance of Henry, an inmate regarded as the top horse trainer, he begins to make progress.

Discovering she's seeking emancipation to sell the house his mother left them for money to move to the east, he refuses.

Once Roman has returned to his cell, his addict cellmate Dan blackmails him into smuggling horse tranquilizer like Henry.

The day of the auction arrives, which Roman invites the pregnant Martha to attend with the hope of improving their relationship.

[5] In October 2017, Susan Sarandon, Gideon Adlon, Bruce Dern, Josh Stewart joined the cast of the film.

The site's critical consensus reads "The Mustang finds fresh perspectives in a familiar redemption tale brought brilliantly to life by powerful performances from Bruce Dern and Matthias Schoenaerts.

"[12] On Metacritic, the film has a weighted average score of 77 out of 100, based on 36 critics, indicating "generally favorable reviews".