Nathan James returns home to Norfolk on a mission to produce and mass distribute the cure. With his family now safely aboard the James, Chandler sends his crew in search of their own friends and loved ones. Who, if any, will find their families? And will those who do return to the ship?.

With a small group of survivors from Solace in tow, Chandler and his crew square off against an enemy of the most dangerous kind - a nuclear-powered submarine led by rogue British naval officers, Sean and Ned Ramsey. XO Slattery interrogates a captured mercenary from the hospital ship in an effort to extract information on the sub and its mission. As Nathan James engages in a perilous game of cat-and- mouse, the truth about the mercenary sub unfolds.