 Gibbard and Harper (1978: Sec. 11) present a problem for causal decision theory using an example drawn from literature. A man in Damascus knows that he has an appointment with Death at midnight. He will escape Death if he manages at midnight not to be at the place of his appointment. He can be in either Damascus or Aleppo at midnight. As the man knows, Death is a good predictor of his whereabouts. If he stays in Damascus, he thereby has evidence that Death will look for him in Damascus. However, if he goes to Aleppo he thereby has evidence that Death will look for him in Aleppo. Wherever he decides to be at midnight, he has evidence that he would be better off at the other place. No decision is stable. Decision instability arises in cases in which a choice provides evidence for its outcome, and each choice provides evidence that another choice would have been better. Reed Richter (1984, 1986) uses cases of decision instability to argue against causal decision theory. The theory needs a resolution of the problem of decision instability.