Describe the plot in the novel Mission to Kala.

In competition with one another, 19th century European powers rushed to increase their prestige and wealth by seizing colonies in Africa. Germany had been growing as a military power throughout the nineteenth century; it longed to demonstrate its might to the world by becoming a colonizer, and Cameroon was an ideal place for it to create a colony. In 1884 some local chiefs of Cameroon signed treaties ceding their sovereignty to the German government. The Germans resorted to bribery and subtle shows of force to negotiate these treaties; still they faced resistance, to greater and lesser degrees, from nearly every cultural group they encountered.