August Bolte, the richest man in a settlement in German East Africa in the period before World War I, is called "Mamba" by the locals, which is the name of a deadly snake. Despised by the locals and the European settlers alike for his greed and arrogance, Bolte forces the beautiful daughter of a destitute nobleman to marry him in exchange for saving her father from ruin. Upon her arrival in Africa, she falls in love with an officer in the local German garrison. When World War I breaks out, Bolte, unable to avoid being conscripted, foments a rebellion among the local natives.

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