Lyme disease is spreading rapidly around the globe as ticks move into places they could not survive before. The first epidemic to emerge in the era of climate change, the disease infects half a million people in the U.S. and Europe each year, and untold multitudes in Canada, China, Russia, and Australia.

Mary Beth Pfeiffer shows how we have contributed to this growing menace, and how modern medicine has underestimated its danger. She tells the heart-rending stories of families destroyed by a single tick bite, of children disabled, and of one woman's tragic choice after an exhaustive search for a cure.

Pfeiffer also warns of the emergence of other tick-borne illnesses that make Lyme more difficult to treat and pose their own grave risks. Lyme is an impeccably researched account of an enigmatic disease, making a powerful case for action to fight ticks, heal patients, and recognize humanity's role in a modern scourge.