Randolph Clarke examines free will in the context of determinism on the one hand, and the notion that this choice may in fact be random and arbitrary on the other. In the first half of the book, he provides a careful, 'conceptual' assessment of the various libertarian theories that do not appeal to agent causation, and contends that they fail to provide an adequate account of the control required by free will. The second half is a development of his own theory of causation, where he suggests that a satisfactory account of this type of control is possible and necessary, constituting a significant advance in our understanding of free will and the moral responsibility that follows from it.