France, January 1793. As the Convention completes the trial and execution of Louis XVI, Sir Percy Blakeney enters the country disguised among a wandering group of musicians. The deliberately unimpressive band allows him to listen in taverns and move through districts where officials are searching for hidden aristocrats and suspected English agents. His immediate objective is to save the La Rodière family and others marked for arrest.
Percy’s performance turns music, noise and public disorder into cover for a rescue around the Château de la Rodière. Chauvelin arrives determined to expose the deception, while treachery inside the travelling company threatens the League’s plans. The novel places its adventure in the weeks when the king’s death radicalised the Revolution and intensified the risk faced by anyone associated with monarchy or foreign intervention.