In 117 AD, the Roman Empire was expanding. But in northern Britain, the expansion was blocked by the local barbarians, the Picts. Centurion Quintus (Michael Fassbender) was appointed to lead the victorious Ninth Legion of the Roman Legion to annihilate the Picts because he survived the attack of the Picts. But the Ninth Legion was ambushed by the Picts, and the commander of the legion, General Verius (Dominic West), was captured. Quintus fought the enemy to the death and escaped with some people. Not only did they have to face the pursuit of the Picts, but they also hoped to rescue the general. They didn't know that Etain (Olga Kurylenko), whose family was killed by the Romans and whose tongue was cut off, was full of anger and was hunting them down. A dangerous resistance war to escape from the Roman border is starting...