"The great Roxhythe" by Georgette Heyer is a historical novel written in the early 20th century. Set amid Restoration politics, it follows the charismatic yet enigmatic Marquis of Roxhythe—favorite of King Charles II—on a covert mission to court William of Orange, with a keen young secretary, Christopher Dart, drawn into espionage and statecraft. Expect court intrigue, rival ministers, continental travel, and a tension between loyalty to a monarch and loyalty to a nation. The opening of the novel introduces Whitehall’s glitter and gossip before King Charles privately tasks Roxhythe with secretly approaching his nephew William to secure England’s advantage despite the recent alliance with Holland. Briefed—uneasily—by Buckingham and Ashley-Cooper, Roxhythe recruits Christopher Dart, stages a public royal rebuff as cover, and sets out for the Low Countries. In Flushing and along the Dutch road, he deftly plays off suspected spies (including the amenable Mr. Milward and a man linked to Hyde), feigns illness at Rotterdam with the help of the loyal apothecary de Staal, and slips away by night. Reaching The Hague, he enlists Christopher’s brother Roderick—now devoted to William despite De Witt’s oversight—and quietly secures a clandestine evening audience with the Prince. (This is an automatically generated summary.)