In smelly old London, everyone blames the spread of disease on rotting garbage and bad air. So when cholera strikes in 1854, city officials throw up their hands. Bad air is everywhere. There's nothing to be done!

Then along comes a medical doctor with a brand-new theory about cholera. But to save lives, Dr. John Snow must prove his theory is correct—and there's not much time! So John knocks on doors, asks questions, and maps the data he collects. He needs evidence, and he needs it fast, before more lives are lost...

This suspenseful true story shines the spotlight on a doctor whose discoveries changed the world and who still inspires budding scientists to this day.

From the dust jacket