From its title, I didn't quite know what to expect, but must say found this a really interesting book. It takes as its germ of choice Borelia Bergdorferi and proceeds to describe how it was discovered, what its life-cycle is like, the impact of environmental change, and how it interacts with its hosts. Since this is the spirochete responsible for Lyme disease, something I had heard of but knew little about, it presented quite an important lesson as well, about how human interference in ecosystems has ultimately caused illness among ourselves. It is quite a slender volume, but very well-written, and has certainly whetted my appetite for the subject. It is aimed at the layman, and if you have any interest in the subjects of microbiology or the environment, it is definitely worth buying and reading.