The Angel of the Revolution: A Tale of the Coming Terror (1893) is a science fiction novel by the English writer George Griffith. It was his first published novel and remains his most famous work. It was first published in Pearson's Weekly and was prompted by the success of "The Great War of 1892" in Black and White magazine, which was itself inspired by The Battle of Dorking.

A lurid mix of Jules Verne's futuristic air warfare fantasies and the utopian visions of News from Nowhere, and a precursor of H. G. Wells' future The War in the Air and the war invasion literature of George Tomkyns Chesney and his imitators, it tells the tale of a group of self-styled 'terrorists' who conquer the world through airship warfare. Led by a crippled, brilliant Russian Jew and his daughter, the 'angel' Natasha, 'The Brotherhood of Freedom' establish a 'pax aeronautica' over the earth after a young inventor masters the technology of flight in 1903. Protagonist Richard Arnold falls in love with Natasha and joins in her war against established society in general and the Russian tsar in particular.

A sequel, The Syren of the Skies, appeared in Pearson's Weekly and was published in book form as Olga Romanoff in 1894.

The story begins on September 3, 1903, with twenty-six-year-old Richard Arnold, a scientist devoted to the invention of a flying machine, finally realizing his dream in the form of an air-ship that could fly on its own. Having given all his resources to the project, Arnold didn't have enough money to live on. He wandered the streets of London, until a stranger overheard his muttering about a flying machine that he wouldn't want to be used by tyrants or for war and destruction. The stranger introduced himself as Maurice Colston, and the two men soon realized they shared a distaste for autocracy and the status quo, feeling "at war with Society".

With Colston's assistance, Arnold met other heads of the "Brotherhood of Freedom", a revolutionary organization of anarchists, nihilists, and socialists bent on ending the society of oppression and misery. Agreeing with their cause, he put his knowledge and skills at their disposal, while retaining control of his invention. During the meeting he was introduced to Natasha, the Angel of the Revolution, and immediately fell in love with her. However, the cause was of far greater importance, and romance had to wait. Equipped by the Brotherhood with everything he needed, Arnold finished the construction of the world's first air-ship: the Ariel.

The air-ship was first used to rescue Natasha in March 1904. She had been arrested by Russian government agents about the time Ariel was built. On their flight towards the designated town in Russia where they would attempt to rescue Natasha, the "Terrorists" - as everyone called the members of this secret order - decided to show the world the air-ship's destructive power. The strongest European fortress, Kronstadt, on an island in the Finnish Gulf, was selected as a target. Within minutes, the weapons of Ariel left the fortress in ruins. With the air-ship and the Brotherhood's many agents, the Terrorists managed to rescue Natasha before the convoy of political prisoners reached Siberia. News of the mysterious air vessel and its power travelled all over the Western world, causing fear and panic in the ranks of both common people and the upper classes.

Meanwhile, after forty years of peace, European powers were readying for the inevitable final clash: plans were being laid down, treaties made and tested, armies equipped and mobilized. Attempting to control the coming war and make it the war to end all wars, Terrorists set off to find suitable headquarters from which they could send orders and organize their own troops without being distracted. A region in the midst of Africa, called Aerial by the English explorers who found it, was perfect. The region was a valley paradise surrounded by high mountains, unreachable by any conventional vessel - except the air-ship. There, Arnold and Natasha finally swore their love to each other, agreeing to wait until the war to end all wars had ended and eternal peace restored to Earth. In the meantime, the Terrorists built eleven more air-ships identical to Ariel and the twelfth - a flagship - twice the size, with twice the firepower.

As Europe sank into war between the Anglo-Teutonic Alliance (led by Britain, Germany and Austria) and the Franco-Slavonian League (led by Russia, France and Italy), war proved to be more devastating than ever, especially with the Russians and French employing their new war-balloons. The balloons, although in many ways inferior to Terrorists' air-ships, destroyed fort after fort, city after city, and secured numerous victories for the Franco-Slavonian League. Even though they could only drop dynamite from above, war-balloons were causing such havoc that the German and Austrian armies were losing land fast. In the early weeks of the war, the Terrorists tried to remain neutral, occasionally appearing here and there and settling their own issues with involved sides or their weapons of war, pushing their own well-planned agenda slowly but steadily. Still, because of treason in their own ranks, the Terrorists lost an air-ship to the Russians. Pursuing the vessel in an attempt to either retrieve or destroy it, the Terrorists finally recaptured the lost air-ship. They witnessed the destructive power that the Franco-Slavonian League had at its disposal, and knew that Britain and her allies had no chance of winning such a war.