It is 1914 and while battles rage across Europe, three empires fight for dominance in the Middle East. In the midst of the chaos is Kingdom Lock. Working for the British Intelligence Service, Lock is sent to Persia by the Australian Infantry Force. His mission: to prevent a German spy from inciting rebellion among the Muslim tribes and from seizing control of the oilfields. But before then, having recently rescued Amy Townshend, the daughter of a British officer, he now finds that he must save her from the clutches of death once more. It's a task that seems destined to fail ...