"Hannah, Compton, and Kira have been close friends since medical school, reuniting once a year for a much-needed vacation. Just as they gather to travel in Spain, an outbreak of a fast-spreading virus throws the world into chaos. When Compton Winfield returns to her job as an ER doctor in New York City, she finds a city changed beyond recognition-and a personal loss so gutting it reshapes every aspect of her life. Hannah Geier's career as an ob-gyn...