Tom Sorell's 'Descartes: A Very Short Introduction' provides an incisive and accessible guide to the complex philosophical ideas of René Descartes, widely regarded as the father of modern philosophy. This concise book delves into Descartes' foundational contributions, including his famous 'Cogito, ergo sum' ('I think, therefore I am'), his methods of doubt, dualism, and his groundbreaking work in metaphysics and epistemology. Sorell expertly navigates the historical context and enduring legacy of Descartes' thought, making his profound influence on Western philosophy understandable for students and general readers alike. It's an essential starting point for anyone seeking to grasp the core tenets of rationalism and the mind-body problem.