In the towering and long-awaited conclusion of the Gibraltar Quartet, the fates of kingdoms and empires are decided on lonely mountain tops, bloody battlefields and darkened rooms. The tide of Muslim conquest threatens to sweep away the tottering Visigoth kingdom in Spain, and the throne of the emperor in Constantinople is disputed by an unlikely challenger. A man is reborn, finding a new purpose in life as he reunites with a love from his past. Epic in scope, The Presence of Mine Enemies recreates the world of the early eighth century and its clash of cultures and religions.