The Storm of Heaven - Harlan, Thomas

The great three-sided war continues: Rome against Persia against the tribes of the desert now commanded by Mohammed of Mekkah. But there is hope for the West. Prince Maxian, horrified at being the cause of so many deaths, has come to realize that the Oath need not be broken; it can be changed by a skilled sorcerer. (July)

The Storm of Heaven 2002, Tor Books, New York

ISBN-13: 9780812590111

Mass-market paperback

The Storm of Heaven 2001, Tor Books, New York, NY

ISBN-13: 9780312865597