On December 9, 1979, smallpox, the most deadly human virus, ceased to exist in nature. After eradication, it was confined to freezers located in just two places on earth: the Center for Disease Control in Atlanta and the Maximum Containment Laboratory in Siberia. But these final samples were not destroyed at that time, and now secret stockpiles of smallpox surely exist. For example, since the fall of the Soviet Union in 1991, and the subsequent end of its biological weapons program, a sizeable amount of the former Soviet Union's smallpox stockpile remains unaccounted for, leading to fears that the virus has fallen into the hands of nations or terrorist groups willing to use it as a weapon. Scarier yet, some may even be trying to develop a strain that is resistant to vaccines. This disturbing reality is the focus of this fascinating, terrifying, and important book.

A longtime contributor to The New Yorker and author of the bestseller The Hot Zone, Preston is a skillful journalist whose work flows like a science fiction thriller. Based on extensive interviews with smallpox experts, health workers, and members of the U.S. intelligence community, The Demon in the Freezer details the history and behavior of the virus and how it was eventually isolated and eradicated by the heroic individuals of the World Health Organization. Preston also explains why a battle still rages between those who want to destroy all known stocks of the virus and those who want to keep some samples alive until a cure is found. This is a bitterly contentious point between scientists. Some worry that further testing will trigger a biological arms race, while others argue that more research is necessary since there are currently too few available doses of the vaccine to deal with a major outbreak. The anthrax scare of October, 2001, which Preston also writes about in this book, has served to reinforce the present dangers of biological warfare.

As Preston eloquently states in this powerful book, this scourge, once contained, was let loose again due to human weakness: "The virus's last strategy for survival was to bewitch its host and become a source of power. We could eradicate smallpox from nature, but we could not uproot the virus from the human heart." --Shawn Carkonen