Desert Stars. The Hameji Cycle, #2

Honor, love, and destiny clash in an interstellar empire that has forgotten its holiest legend: the story of Earth. He is sheikh's sole heir, a young man raised by desert tribesmen after falling from the stars. She is the sheikh's most beautiful daughter, promised his hand in marriage-but only if she can convince him to stay. Together, they must travel to a land where glass covers the sky and men traverse the stars as easily as tribesmen cross the desert.
At the ancient temple dedicated to the memory of Earth, they hope to find the answers that will lead them home. But the call of the stars soon threatens to bring their budding romance to an end. And as the moment of decision draws near, the choices they must make will drive them toward a future that neither can foresee.