When I was asked to review a book on psychiatric genetics, memories of dry lectures involving arcane statistical techniques flooded my brain, as did thoughts of the specter of psychiatric biological determinism. I was very pleasantly surprised. The authors have created an easily read primer, leading the reader from very basic principles through a catalog of modern genetics theory and technique, using frequent clinical examples. Contrary to my fears, the role of environmental influences is consistently pointed out. Perhaps most importantly, this is done with a free-flowing, enthusiastic style that is a pleasure to read.