Ahead of the German Blitz during World War II, English parents from every social class sent their children to the countryside for safety, displacing more than three million young offspring. In The Secret Guests, the British royal family takes this evacuation a step further, secretly moving the princesses to the estate of the Duke of Edenmore in "neutral" Ireland. A female English secret agent, Miss Celia Nashe, and a young Irish detective, Garda Strafford,...