1st ed. - New York : Atheneum Books for Young Readers, c2011.
293 p. : ill ; 22 cm.
In the early nineteen-hundreds, sixteen-year-old Prudence Galewski leaves school to take a job assisting the head epidemiologist at New York's Department of Health and Sanitation, investigating the intriguing case of "Typhoid Mary, " a seemingly healthy woman who is infecting others with typhoid fever. Includes a historical note by the author.