Adventurer Allan Quartermain leads an expedition into uncharted African territory in an attempt to locate an explorer who went missing during his search for the fabled diamond mines of King Solomon.
John Zinga, a descendent of slaves, has an ancient medallion around his neck and a fragment of song passed down generations. He is an English dockworker with a magnificent voice and a yearning to learn his roots.
A British District Officer in Nigeria in the 1930s rules his area strictly but justly. He struggles with gun-runners and slavers with the aid of a loyal native chief.