In 1848, Hornblower, now 72, is enjoying a comfortable retirement on his country estate at Smallbridge, Kent. Recently promoted to the well-paid but honorary rank of Admiral of the Fleet, he reflects that life as a country gentleman is pleasant and secure but dull. Hornblower is still married to Lady Barbara, and his sailor-servant Brown still attends him, although now as a butler. The fear of financial insecurity that has haunted Hornblower throughout his career is now lifted and he is now able to consider further subsidising his son Richard's expenses as a colonel in the Guards.
Late one stormy night, a well-dressed Frenchman, claiming to be Napoleon, arrives at the front door of Hornblower's mansion. Perceived by Hornblower as speaking a mix of sanity and nonsense, the visitor had been travelling by rail to Dover to take ship for France. However a landslip has delayed the train near Smallbridge Park, and he is urgently seeking assistance to complete his journey. Barbara is favourably impressed with the man's charming manners and persuades her husband to provide a carriage, although Hornblower remains convinced that the Frenchman is a lunatic.
A month later, the Hornblowers learn that the man is Prince Louis Napoleon Bonaparte, nephew of Napoleon I, and the future Emperor Napoleon III. He was on his way to Paris to contest the office of President of France. After winning the election, the Prince-President confers on Hornblower the insignia of a Chevalier of the Legion of Honour and sends a sapphire to Barbara in gratitude for their timely aid.