In 2002, John Tull and his wife, Lucinda, were visiting New York City when they both fell gravely ill. They experienced pounding headaches, strange swellings, and bone-crushing body aches. Doctors then made a startling discovery. Blood tests revealed that John and Lucinda had the bubonic plague—a rare disease transmitted by fleas! Read John and Lucinda's harrowing tale of survival, and learn all about fleas and the deadly diseases they carry in this engrossing narrative nonfiction book for young readers.