The Silversteins, long known for their clear, well-researched books on health topics, are here joined by their son--in a detailed look at a troublesome disease that has recently become more widespread. A foreword by Leonard H. Sigal, M.D., suggests that the book's purpose is ""to allay fear and to educate."" The latter goal is met well as the Silversteins survey the history of Lyme disease, describe its course, and present the tick's life cycle. With many specifics, they give a sense of the disease's bewildering array of symptoms and possible treatments, the difficulties in diagnosing it, and the status of research. But aside from the fact that Lyme disease--though it can be exceedingly disagreeable--is rarely life threatening, and that even in high-risk areas the chances of getting it are not overwhelming, there's little comfort here. The choice remains: stay inside; take the chance of venturing out as usual; or go to laborious but not guaranteed lengths to baffle or repel the dread tick. Dry and occasionally repetitious, although the information is well researched and well organized, serving not only to inform but to exemplify how the medical and research communities address a peculiarly knotty problem. A question-and-answer chapter serves as an excellent summary. Suggested reading; list of organizations; glossary; index.