Thomas Sorell seeks to rehabilitate views that are highly unpopular in analytic philosophy and often instantly dismissed. His book serves as an interpretation, if not outright revision, of unreconstructed Cartesianism and responds directly to the critique of contemporary philosophy. To identify what is defensible in Cartesianism, Sorell starts with a picture of unreconstructed Cartesianism which is characterized as realistic. Bridging the gap between history of philosophy and analytic philosophy, Sorell also demonstrates how some contemporary analytic philosophy is deeply Cartesian.