Brilliant biochemist Emma Caldridge is back, except this time there's nowhere to run. . . . Emma Caldridge is on mile thirty-six in an ultramarathon in South Africa when a roadside car bomb explodes. She wakes from the blast to find that a man has injected her with an unknown substance. Shaken by the event, she calls Edward Banner of the security company Darkview for help, but Banner currently has his hands full with another emergency: Somali pirates in the Gulf of Aden have attacked a cruise ship, and Darkview has been hired to assist with the rescue. According to intelligence sources, the ship could be carrying a new weapon of unknown origin. Suspecting that it may be chemical in nature, Banner asks Emma to infiltrate the ship and use her professional expertise to identify it. Emma knows it's a risky job and one that she might not survive. But when she learns that special agent Cameron Sumner is among the hostages, nothing will stop her from getting on board, no matter what the cost