As a sympathetic—and brilliant—brain detective Harold Klawans treated people with a huge array of troubles all of which boiled down to one complaint: something was wrong with their brains. From the woman suffering from painful foot and moving toe syndrome to the Indiana farmer who contacted a variant of mad cow disease from his herds of livestock Klawans deduced a great deal from his patients not only about the immediate causes of their ailments but about the evolutionary underpinnings of their behavior.