The Dark of the Sun by Wilbur Smith
The Congo. Situated at the heart of sub-Saharan Africa, it is a place where men die for diamonds. For love. And for the unholy pleasure of others…
Bruce Curry is the leader of a mercenary band with the dubious support of three officers. His mission: To relieve a diamond-mining town cut off by the fighting and retrieve a priceless consignment of diamonds. Along the way, he meets a beautiful Belgian woman. Shermaine is a dream come true. But the rest of Curry's journey is about to become a living nightmare.
Ranged against his ill-disciplined unit are bandits, guerrillas, and hostile tribes that infest the land. In a sinister atmosphere of omnipotent evil, Curry fights to stay alive--and protect Shermaine, his one true love. But to do so, he must face another, even deadlier enemy: one of his own men…