In 1920, Jaeger began writing for Time and Tide, a feminist journal, and Vogue before setting out on an independent writing career. Jaeger's four novels dealt with such topics as extrasensory perception, utopian speculation, and genetic engineering and are considered important for their place in the history of science fiction. Her first science fiction novel, The Question Mark, was published in 1926, depicting a protagonist who woke after many generations to find himself in a utopian Britain of 200 years hence. The Question Mark evolved the concept of utopia originated by writers such as H.G. Wells, predating and possibly informing such works as Huxley’s Brave New World and George Orwell’s Nineteen Eighty-Four. In 1927, Jaeger wrote her second novelthe Man with Six Senses about a weakly youth Michael, endowed with unrefined psychic talents, who was helped towards maturity by his sympathetic girlfriend, Hilda. In 1929, Jaeger's first non-fiction book Sisyphus: Or, the Limits of Psychology was published. After a six-year gap in her fiction work, Jaeger's third novel Hermes Speaks was published in 1933 and explored the consequences of following the prophecies of a preternaturally intelligent child groomed into becoming a fake medium. Jaeger's fourth and final novel Retreat From Armageddon was published in 1936 and was a future war novel featuring a group of people who withdraw from a clearly named World War II to a remote country house where they philosophise upon the humankind's shortcomings; the novel was notable for its advocacy of genetic engineering. Retreat From Armageddon was not well-received by critics and Jaeger abandoned her fiction career before World War II. Though critical response and limited sales ultimately led her to stop publishing, Jaeger made her mark with dynamic critiques of modern Western civilization and brought a unique voice to the struggles of subjectivity and scientific reason that shook the post-Victorian mindset. Jaeger continued her writing career beyond fiction. She wrote plays including The Sanderson soviet; a comedy in three acts. She also wrote many non-fiction books including popular history and biographies such as Sisyphus: Or, the Limits of Psychology, Experimental lives from Cato to George Sand, Wars of Ideas, Liberty versus equality, Shepherd's trade, and Before Victoria : changing standards and behaviour, 1787-1837. Jaeger never married and died in Tunbridge Wells, Kent in November 1969.
Works
The Question Mark
The Man with Six Senses
Sisyphus: Or, the Limits of Psychology
Experimental lives from Cato to George Sand
Hermes Speaks
The Sanderson soviet; a comedy in three acts
Retreat from Armageddon
Wars of Ideas
Liberty versus equality
Shepherd's trade
Before Victoria : changing standards and behaviour, 1787-1837