Cry Wolf by Wilbur Smith

The year is 1935, shortly before World War II. The "Wolf of Rome", Italy's army under Mussolini, is poised to invade Ethiopia, whose army is not only ill-equipped, but also severely outnumbered. Desperate to save his troubled land, Emperor Haile Selassie enlists American Jake Barton and Englishman Gareth Swales, two risk-takers who both share a taste for danger and the thrill of adventure. The mission seems simple: Deliver four ancient refurbished armored cars and Vicky Camberwell, an American journalist, in exchange for a hefty weight of gold. But soon Jake and Gareth realize that this is just the beginning of a long, harrowing journey that will take them from the sea to the scorching deserts of Africa to the peaks of its treacherous mountains, where a dramatic struggle to stay alive awaits them...