Sunset and the Major — Julian Jay Savarin

A Muller and Pappenheim adventure - Muller is trying to come to terms with having led the shadowy Semper organisation to the Australian Outback where they murdered his parents. Meanwhile, Pappenheim has discovered that a trusted friend has betrayed him, and he wants revenge. And Carey Bloomfield, who has been growing close to Muller, is shocked to be told the true purpose of her mission to betray Muller. The Semper, however have their own ideas, forcing Muller's hand . . .