ON ALERT. A nuclear bomb has gone missing. At the same time Room 59, a covert unit of the International Intelligence Agency created to fi ght terrorist cells, intercepts a communiqué from U.S. Border Patrol agent Nathaniel Spencer. A known terrorist, thought to be dead, is back in business. .AND UNDERCOVER Tracy Wentworth is working for the Department of Homeland Security when she's contacted by Room 59 for an inside job. Aligned with Agent Spencer and backed up by Room 59's considerable resources, they are to assess and eliminate the threat, using any means necessary. But as they delve deeper into Mexico's criminal underworld, it soon becomes clear that someone is planning a massive attack against America.one that would render the entire nation completely defenseless!