This is a book of three philosophical chapters on aspects of terrorism, torture, and war. It relates issues in ethical theory to practical ethics. The chapter on torture considers views about what torture is and the various occasions on which it could occur in order to determine why it might be wrong to torture a wrongdoer held captive, even if this were necessary to save his victims. The discussion of terrorism examines whether it is the intention to harm civilians rather than harm to them being “collateral damage” that makes terrorism distinctively wrong, what else might make it wrong, and whether it is always wrong. The third chapter first discusses whether having a right reason, in the sense of a right intention, is necessary in order for starting war to be just. It then examines ways in which the harms of war can be proportional to the achievement of the just cause and other goods war can bring about, so as to make starting war permissible.