About the book
Consultation psychiatrist Dr. Mara Valls is used to frightened patients at Seattle's fictional Bellwether Medical Center, so she is unsettled by a schoolteacher who seems to have lost all fear after an unexplained respiratory illness. When he dies unexpectedly and similar cases follow, Mara turns to forensic pathologist Dr. Jonah Reed. Together they confront a mysterious infection that changes how much survival matters, while the danger spreads and her own husband begins to change.