From the depths of the Indian Ocean, a horrific plague has arisen to devastate humankind. But it is merely a harbinger of the doom that is to follow. Aboard a cruise liner transformed into a makeshift hospital, Dr. Lisa Cummings and Monk Kokkalis, operatives of SIGMA Force, search for answers to the bizarre affliction. But there are others with far less altruistic intentions. In a savage and sudden coup, terrorists hijack the vessel, turning a mercy ship into a floating bio-weapons lab. A world away, SIGMA's Commander Gray Pierce thwarts the murderous schemes of a beautiful would-be killer who holds the first clue to the discovery of a possible cure, then joins forces with the woman who wanted him dead. As a relentless madman dogs their every step, Gray and his unlikely ally are pulled into an astonishing mystery buried deep in antiquity and in humanity's genetic code.
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