In medieval Britain, a heavily fortified castle faces an imminent threat from a brutal Celtic tribe seeking revenge for past grievances. The family residing in the castle, led by their matriarch, is unable to fend off the invaders with their dwindling resources and limited number of fighters. In desperation, they turn to their estranged kinsman Guy, a battle-hardened warrior with deep-rooted familial bonds and a dark past. Reluctantly agreeing to help, Guy assembles a small but skilled group of mercenaries, each with their own unique abilities and motivations. The stakes are high: protect the ancestral home and ensure the survival of their legacy amidst the chaos and bloodshed.

As tensions mount and the siege intensifies, alliances are tested and the characters face both external threats and internal conflicts. The determined defenders must navigate treachery, shifting loyalties, and personal demons while executing their strategies to repel the relentless attackers. With limited time and resources, the situation becomes increasingly dire, pushing each character to their limits. Through grueling battles and strategic maneuvers, they endeavor to overcome overwhelming odds in a fight for honor, family, and survival.