After spending a day at the Oregon zoo with 5-year old Gracie, Anna Sanders reaches a decision: she will risk anything and everything to give her daughter and her granddaughter the chance of a livable future.But first she has to come to terms with her past. She reaches out to two childhood friends who she was in college with: Mac, a hard-drinking, pot-smoking professor of physics and climatology in Wisconsin, and Danny, an introverted college dropout...