The news out of China was not good: there were signs that a new disease might be big—scary big, like a brushfire coming at you uphill. Authorities, medical and political, saw no reason to worry and little need for tests. Michael Lewis’s riveting nonfiction thriller pits a rogue band of visionaries, working under the radar, against the weight and disinterest of officialdom. It is a race against time, and the deadline is now … or yesterday.