Sara Paretsky is the award-winning creator of the V.I. Warshawski detective novels. When Sara introduced V.I. in Indemnity Only in 1982, she revolutionized the mystery novel. By creating a female investigator who uses her wits as well as her fists, Sara challenged a genre in which women were traditionally either vamps or victims. Critical Mass is a riveting story that moves between her famous detective V. I. Warshawski's contemporary Chicago and Nazi-occupied Austria.