All frontiers are jealous

"American engineer Dan Courtney is surveying a railway route through the jungles of central Africa when an alluring American woman is kidnapped by the fearsome Dinka warrior tribe. In his attempt to rescue her, Courtney stumbles headlong into a diamond smuggling operation."@en
"American engineer Dan Courtney attempts to survey a railway route through the jungles of central Africa only to be sidetracked when he discovers that an alluring American woman has been kidnapped by the fearsome Dinka warrior tribe. But the plot thickens when he attempts to rescue her and stumbles headlong into a diamond smuggling operation, and the perpetrators want Courtney out of the picture. Permanently."
"American engineer attempts to survey a railway route through the jungles of central Africa only to be sidetracked when an alluring American woman has been kidnapped by the fearsome Dinka warrior tribe. In his attempt to rescue her and stumbles headlong into a diamond smuggling operation, and the perpetrators want Courtney out of the picture--permanently."@en