"Every catastrophe begins with a little problem that doesn't get fixed." So says Pauline Green, president of the United States. A shrinking oasis in the Sahara Desert; a stolen US Army drone; an uninhabited Japanese island; and one country's secret stash of deadly chemical poisons: all these play roles in a relentlessly escalating crisis. Struggling to prevent the outbreak of world war are a young woman intelligence officer; a spy working undercover with jihadists; a brilliant Chinese spymaster; and Pauline herself, beleaguered by a populist rival for the next president election.