General Charles Gordon is sent by the British government to Khartoum in Sudan to evacuate Egyptian forces and civilians after a brutal defeat by the Mahdist rebels led by the fanatical leader, the Mahdi. Upon his arrival, Gordon is struck by the dire situation and the growing threat posed by the Mahdi's forces. Despite clear orders to leave, Gordon chooses to stay and defend the city, drawing on his deep sense of duty and faith. He fortifies the city, attempts to negotiate with the Mahdi, and makes pleas for reinforcements, all while becoming a symbol of resistance for the beleaguered citizens of Khartoum.

The situation grows increasingly desperate as the Mahdi's forces tighten their siege. The British government, preoccupied with other issues and hesitant to commit more resources, is slow to respond to Gordon's requests. Tension escalates between Gordon's determination and the political machinations back in London. Inside Khartoum, food starts running low, and morale fluctuates as hope for rescue diminishes. Gordon's leadership and tactical ingenuity are tested to their limits as he confronts a vastly superior enemy force, knowing full well the dire consequences of failure for both himself and the city he has vowed to protect.