This collection investigates the fundamental relationship between personal identity, causal powers, and the nature of mental states. Sydney Shoemaker, a prominent figure in analytic philosophy, compiles his rigorous inquiries into how mental properties function within a physicalist framework. The essays argue for specific positions on the persistence of persons over time and the causal efficacy of mental properties, utilizing logical analysis to challenge prevailing functionalist and reductionist theories.

Experts regard this collection as a foundational text for students and researchers focusing on the intersection of metaphysics and mind. Readers frequently note the academic density of the prose, which requires a strong background in analytic philosophy to fully grasp the nuances of Shoemaker's arguments.