Olivia Simon is the emergency room physician on duty when a female gunshot victim is brought in. The woman has been shot through the heart. Olivia must act quickly, and the decisions she makes in those few minutes threaten her career and cost her marriage. Midway through the controversial surgery, Olivia learns the identity of her patient--Annie O'Neill, the woman with whom Olivia's husband, Paul, is obsessively infatuated. Annie dies during the surgery.
Annie's death has a devastating impact on the lives of the three people who had come to idealize her. To her husband, Alec, she was a loving wife; to Paul, perfection: and to Olivia, a rival to be emulated. Their worship of her threatens to destroy them all. Only one person has the power to free them from their obsessions. Only one person, the keeper of the light, knows the devastating truth about their beloved Annie.