In March 1900, San Francisco's health department investigated a strange and horrible death in Chinatown. A man had died of bubonic plague, one of the world's deadliest diseases. But how could that be possible? Acclaimed author and scientific expert Gail Jarrow brings the history of a medical mystery to life in vivid and exciting detail for young readers. She spotlights the public health doctors who desperately fought to end it, the political leaders who tried to keep it hidden, and the brave scientists who uncovered the plague's secrets. This title includes photographs and drawings, a glossary, a timeline, further resources, an author's note, and source notes.