This book investigates the viability of agent causation as a foundational explanation for human free will within a broader metaphysical framework. Timothy O'Connor, a prominent philosopher, challenges contemporary physicalist accounts by arguing for a non-reductive theory of agency. He utilizes analytical metaphysical tools to defend the idea that agents can be the ultimate causes of their own actions, distinct from mere event-causation.

Philosophers and academics frequently cite this work as a rigorous contribution to the contemporary debate on libertarian free will. Readers often note the high level of technical density and the sophisticated metaphysical argumentation required to engage with O'Connor's specific ontological claims.