More than 20 warships are closing on the 200-mile perimeter that Marcus Chaplin declared as a no man's land around the island. And as XO Sam Kendal is drawn into a battle on the ground to keep them alive, Prosser confronts Marcus about something personal to him that could be impacting his judgment as Captain of the Colorado.

Even as Marcus and Sam learn that they have been charged with treason against the United States, a greater threat within their own crew is brewing. Meanwhile, an old friend of Sam's, Paul Wells, pays Christine a visit and tries to ease her fears about her husband.