Managing the world's richest diamond mine in former German South West Africa, Harvey Tremayne clashes with a colonial resistance group, intent on restoring their homeland.
They smuggle diamonds destined for the Nazi military rearmament programme.
Tremayne got in their way.
They killed his wife.
Driven by revenge, his hunt for them takes him to places even more dangerous than the terror-filled trenches of his WW1 service.
He's drawn into the shadowy world of British Secret Intelligence,.