The X1 pandemic ravaged the world. Billions were infected, 30 million died. It was not an act of nature. X1 was man-made, a deadly plague deliberately released for one reason only: to force people to take the cure. But the cure is worse than the disease, a sophisticated nanotechnology that has the potential to enslave all humanity. Dr Peyton Shaw's search for the culprits and a countermeasure starts at the ends of the Earth, on a sunken submarine beneath the Arctic ice. It will take her deep into humanity's past, towards a revelation that will rewrite our history... The final thrilling instalment of The Extinction Files will change your very understanding of what it means to be human, blending meticulous scientific research with the heart-pounding fiction that has made A.G. RIDDLE a global phenomenon.