In A Certain Curve of Horn, veteran journalist John Frederick Walker tells the story of one of the most revered and endangered of the regal beasts of Africa: the giant sable antelope of Angola, a majestic, coal-black quadruped with breathtaking curved horns over five feet long. It is an enthralling and tragic tale of exploration and adventure, politics and war, the brutal realities of life in Africa today and the bitter choices of conflicting conservation strategies.

A Certain Curve of Horn traces the sable's emergence as a highly sought-after natural history prize before the First World...