"The Bomb-Makers" by William Le Queux is a historical fiction novel set during World War I, focusing on Theodore Drost, a suspected German professor and enemy alien living in London, and his daughter Ella. The story kicks off in a dimly lit restaurant where Drost and his associate, Ernst Ortmann, express concerns about Ella’s innocence and her developing relationship with a British officer named Lieutenant Seymour Kennedy. As Drost's secret bomb-making operation is revealed in a hidden chemical laboratory, Ella uncovers his plot and notices that her father is creating a dangerous weapon. Alongside her lover, Ella resolves to stop her father’s treasonous scheme to protect her country, which causes a tense confrontation where family loyalty clashes with patriotism and duty.

The Bomb-Makers Being Some Curious Records Concerning the Craft and Cunning of Theodore Drost, an Enemy Alien in London, Together with Certain Revelations Regarding His Daughter Ella
By William Le Queux
In wartime London, a daughter must choose between her love for her father and her duty to her country as she uncovers his secret plot to create a devastating bomb.
Summary
About the AuthorWilliam Tufnell Le Queux was an Anglo-French journalist and writer. He was also a diplomat, a traveller, a flying buff who officiated at the first British air meeting at Doncaster in 1909, and a wireless pioneer who broadcast music from his own station long before radio was generally available; his claims regarding his own abilities and exploits, however, were usually exaggerated. His best-known works are the anti-French and anti-Russian invasion fantasy The Great War in England in 1897 (1894) and the anti-German invasion fantasy The Invasion of 1910 (1906), the latter becoming a bestseller.
William Tufnell Le Queux was an Anglo-French journalist and writer. He was also a diplomat, a traveller, a flying buff who officiated at the first British air meeting at Doncaster in 1909, and a wireless pioneer who broadcast music from his own station long before radio was generally available; his claims regarding his own abilities and exploits, however, were usually exaggerated. His best-known works are the anti-French and anti-Russian invasion fantasy The Great War in England in 1897 (1894) and the anti-German invasion fantasy The Invasion of 1910 (1906), the latter becoming a bestseller.