May 1915. Kingdom Lock and his faithful sidekick, Siddhartha Singh are gunned down on the streets of Basra and suspicion falls on German spy, Wilhelm Wassmuss. Major Ross believes Wassmuss is not only still alive but that he is behind the assassination of a senior Turkish officer, the death of whom has been blamed on Lock. Meanwhile, Lock has discovered that Amy Townshend is pregnant and that the child is his. But the general's daughter stubbornly refuses to break off her engagement with Bingham-Smith. Then, when Lock learns that there is a price on his head and every cut-throat and desperate man in the area is after the bounty, Ross sends him to the frontlines for his own safety....

It is 1914 and while battles rage across Europe, three empires – the Ottoman, the German and the British – fight for dominance in the Middle East. The merciless landscape of Persia and Mesopotamia are prizes to be claimed by the most ruthless opponent. In the midst of the chaos is Kingdom Lock. Working for the British Intelligence Service known as the White Tabs, Lock is sent to Persia on a commission from the Australian Infantry Force. His mission: to prevent a German spy from inciting jihad and rebellion among the Muslim tribes and from seizing control of the precious oilfields. But before then, having recently rescued Amy Townshend, the daughter of a top ranking British officer, from Turkey, he now finds that he must save her from the clutches of death once more. It's a task that seems destined to fail with bloodthirsty, relentless Turks at every turn . . . To complete his mission, Lock must stay one step ahead of the war raging around him. And...