Combining superb investigative reporting with incisive analysis, Jerry Mashaw and David Harfst provide a compelling account of the attempt to regulate auto safety in America. Their penetrating look inside the National Highway Traffic Safety Administration (NHTSA) spans two decades and reveals the complexities of regulating risk in a free society.

Hoping to stem the tide of rising automobile deaths and injuries, Congress passed the National Traffic and Motor Vehicle Safety Act in 1966. From that point on, automakers would build cars under the watchful eyes of the federal regulators at...