Mystery of the Arabian Stallion by Andy Adams

When his friend Ahmed's prized Arabian stallion goes missing, American teenager Biff Brewster gets pulled into a thrilling mystery in Saudi Arabia. Biff and Ahmed follow clues across the desert to uncover a sinister plot to sabotage the region's oil fields. With help from a Saudi prince, they pursue suspects from the glittering palace in Riyadh to gritty pearl diving boats, racing to find proof before time runs out.