In this book Solomon Snyder describes the political maneuverings and scientific sleuthing that led him and Candace Pert, then a graduate student in his lab, to a critical breakthrough in the effort to understand addiction. Their discovery--the so-called opiate receptor--is a structure on the surface of certain nerve cells that attracts opiates. From this very human chronicle of scientific battles in the ongoing war against pain and addiction, we gain an appreciation of the extraordinary intellectual processes of an eminent scientist. But Dr. Snyder's story of scientific brainstorming also affords us rare glimpses into the fruitful, sometimes frustrating, relationships among scientists which enrich and complicate creative work.