Forty-seven-year-old Caelum Quirk teaches high school English in Colorado. It's work he does well and finds satisfying - more satisfying than his marriage to Maureen, a relationship fraught with tension and distance. But that prosaic life, with its professional gratifications and almost commonplace unhappiness, will soon seem like an idyll compared with what follows. The year is 1999, and the high school is Columbine. The shootings take place while Caelum is in Connecticut at the bedside of a dying relative. While Caelum wasn't present, he is a victim: Maureen, who is a nurse at the high school, survives but is utterly traumatized. She suffers from vivid flashbacks and becomes hysterical when she hears sudden loud noises. And soon she has one more problem: an addiction to anxiety medications. Caelum quickly decides that the only way to save their marriage - and Maureen's sanity - is to leave Colorado.