She and her sister Rumer were sent to England for their education at the ages of 7 and 6, but the outbreak of World War I caused their parents to arrange their travel to Narayanganj, to which their father had been transferred from Assam while they were abroad.
In addition, Jon revealed substantial artistic talent, winning a gold medal intended for adult entrants at an art exhibition in Gulmarg, in Kashmir.
Though she returned to England with her now-retired father and her mother in the spring of 1936 and briefly stayed with them in Totnes, Devon, she soon set off back to India with Rumer, who had married and established a Calcutta dancing school.
It was, indeed, as Jon's novels continued to be – she published ten in all over the next thirty years – much cooler in style and darker in content than Rumer's later books."
As Chisholm further points out, Jon was praised by critics but was little interested in the "market place," since she had no need to earn a living, owing to her financially stable marriage.
After her death, in 1989, Rumer published Indian Dust, a collection of stories and poems set in India and written by her and by Jon, some as early as 50 years previously.