A Flaw in the Ointment is at once a challenging book and an enjoyable read, in which author Michael Perilstein presents a well-reasoned perspective on the nature of time and space, and the illusion of free will. Filled with engaging thought experiments, the volume provides ample exercise for the mind. Especially thought-provoking is the authors pointed critique of religion, which will remind some of Christopher Hitchins controversial God Is Not Good. Yet, the implications of Perilsteins theories reach well beyond a simple statement of atheism. Ultimately, those much broader ideas are at the heart of this book, and the reader with an open mind will have much to consider.