This book explores the idea that there is a gray area in ethics. My central claim is that some acts are somewhat right and somewhat wrong, meaning that deontic concepts such as RIGHT and WRONG (capitalized to indicate that we are discussing the concepts and not the entities they refer to) are gradable. Philosophical theories of indeterminacy and vagueness can shed light on some aspects of the gradualist hypothesis, but they leave important questions open. It is, for instance, not clear what a morally conscientious agent should do if she must choose among options that are somewhat right and somewhat wrong.