The libertarian theory of free will combines a negative thesis and a positive thesis. The negative thesis is that free will is incompatible with determinism. The positive thesis is that there are actions that involve exercises of free will---'free actions, ' for short. While remaining neutral on this negative thesis, Aspects of Agency develops a detailed version of the positive thesis that represents paradigmatically free actions as indeterministically caused by their proximal causes and pays special attention to decisions so instigated. The bulk of Mele's work is a masterful defense...