Ultra-runner and chemist Emma Caldridge passes mile 35 of the Comrades ultramarathon in South Africa when a roadside bomb explodes. Dazed and disoriented from the blast, she wakes to find a man injecting her with a high tech epi pen. Within minutes her body recovers and she races to the finish line, stronger than when she began. Shaken by the event and unsure of what was injected into her, she calls Edward Banner of the security company Darkview for help.
But Banner has his hands full with another emergency. Somali pirates in the Gulf of Aden are attacking a cruise ship filled with passengers, and Darkview has been called in to assist with the rescue. Intelligence sources report that the ship carries something more than just wealthy passengers, and authorities fear that in its hold is a new weapon of unknown origin. What the intelligence reports don't say, and Edward Banner won't confirm, is that special agent Cameron Sumner is also on the ship.
With some reports claiming that the substance is chemical, Banner turns to Emma to infiltrate the ship and use her skills to determine the nature of the weapon. Once she learns that Sumner is on the ship, she begins her trek into one of the most dangerous areas of the world.