In 2016, it was adapted into a audio theatre, Staring Jack Farthing, John Rhys Davies, Cathy Sara, Christina Greatrex, David Morton and Daniel Philpott.

The marquis is impressed by Harry's confidence and self-possession in such an unfamiliar environment, but the rest of the family remains unconvinced and mocks his strange mannerisms and rough appearance.

As a member of the French nobility, the marquis and his family are loyal to King Louis XVI and are deeply troubled by the growing violence and unrest in Paris and the countryside.

On the day of the September massacres the prisoners throughout Paris are brought out for mock trials and systematically executed, including the Marquis and Marquise de St. Caux.

Victor de Gisons, Marie's fiancé who stayed in Paris to watch out for her, sees his father brought out for trial and flies into a rage.

Virginie marries one of Harry's brothers, Tom, and the girls and their husbands later travel back to France for a short time to stay with Marie and Victor, who, after fighting in the French Army under Napoleon, purchases the chateau that once belonged to the Marquis de St. Caux.

It was published nearly a century after the events of the French Revolution, and in his preface Henty states that the purpose of the novel is not "to impart historical knowledge, for the facts of the dreadful time when 'the terror' reigned supreme in France are well known to all educated lads."

Like many of Henty's historical adventure novels, In the Reign of Terror emphasises the importance of British morals and encourages young boys to be courageous and virtuous.

Henty's historical adventure novels were primarily written for children, which is reflected in his simplistic writing style and straightforward narrative.

Supporters of the Revolution are portrayed as universally bloodthirsty and out of control, and the French nation as a whole is said to be descending into madness while Britain stands as a stalwart symbol of imperial strength.

Henty's adventure novels "have been examined by a number of historians, all of whom agree that his books reflected and reinforced imperial sentiments,"[3] and nationalism is a common theme in his work.

Harry Sandwith is positioned as the paragon of British boyhood, combining physical strength and manly ruggedness with courage, modesty, and integrity.

The Marquis de St. Caux states that he hopes his sons will "acquire something of the manly independence of thought and action which distinguishes English boys," and Harry is often described in contrast to Ernest’s more refined, and therefore feminised, identity.

"[1] The theme of class divisions is threaded with nationalistic rhetoric: Harry’s father states that "the condition of the vast body of the French nation has been terrible," and that England, in contrast, has "long conquered our liberties."

The story is one of Mr. Henty's best,"[4] and the Birmingham Post says, "The difficulties and perils Harry has to encounter bring out the heroic and steadfast qualities of a brave nature...