When an old collaborator gets severely injured, a veteran policeman tries to figure out the way to bring to justice the ultimately suspected aggressor, a spoiled young executive, heir to a mega corporation, who believes he is above the law.

Soldier Robert Miller returns home from Afghanistan unable to fit back into society. Living on a violent council estate and finding work in undercover surveillance, he becomes obsessed with taking down a group of local gangsters who are intrinsically tied to a suspected terrorist cell. Taking the situation into his own hands, Robert embarks on a brutal quest for justice, with devastating consequences.

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After spending 20 years searching for the object of his vengeance, Sekiya Kanbei discovers he is now a ronin. Inui Sanshiro was the head of a clan until his son succeeded him, or so he says. Genmu claims to have once been a ninja. These three elderly men join forces to travel the Japanese countryside together. Along the way, they encounter situations that bring out the "warrior" in each of them, and soon they are fighting the corruption and injustices that plague the common people.