KINGDOM OF SHADOWS follows three people grappling with the hard choices and destructive consequences of the U.S.-Mexico "drug warâ?. Filmmaker Bernardo Ruiz weaves together the seemingly disconnected stories of an activist nun in deeply scarred Monterrey, Mexico, a U.S. Federal agent on the border, and a former Texas smuggler to reveal the human side of an often-misunderstood conflict that has resulted in the "disappearanceâ? of more than 23,000 people in Mexicoâ??a growing human rights crisis that only recently has made international headlines.