After two years at the St. Louis U.S. Marshal's Office, Casey Sloane is tasked with escorting a reporter to D.C. to testify before a grand jury. The reporter's research on an up-and-coming environmentalist who disappeared is now even more vital than anticipated. At first, the assignment seems routine. But an attack on the Marshal's Office puts everyone on high alert. When Casey and two other marshals--one a man from her past--are forced on the run with the reporter, they'll do whatever it takes to protect their witness and make it out alive.