In this riveting thriller - from the Pulitzer Prize winner and best-selling author - Dr Henry Parsons, an unlikely but appealing hero, races to find the origins and cure of a mysterious new killer virus as it brings the world to its knees.

At an internment camp in Indonesia, 47 people are pronounced dead with acute hemorrhagic fever. When Henry Parsons - microbiologist, epidemiologist - travels there on behalf of the World Health Organization to investigate, what he finds will soon have staggering repercussions across the globe: an infected man is on his way to join the millions of worshippers in the annual Hajj to Mecca.

As international tensions rise and governments enforce unprecedented measures, Henry finds himself in a race against time to track the source and find a cure - before it’s too late....