Julia Probyn is a part-time agent for British Intelligence.
She is also an occasional reporter and a full-time traveler with a love of adventure and a knack for finding it.
A young woman who had inherited a decent fortune upon the death of her parents, Probyn is an only child with no close relatives and nothing to keep her from enjoying her love of travel.
In her early 20's when the series begins, Probyn is described as "tall, and built on full if graceful lines". She had a smooth oval face made to look leaner by the fact that she wore her tawny blonde hair pulled back from her face "to hang a ... half-way down her shoulders." She had large grey-blue eyes which her friends described as doves' eyes and her few enemies called cows' eyes. One elderly lady who did not care for Probyn thought one that she "was the arch-type of the dumb blonde. The only exception to the type was the fact that she was nothing like as dumb as she looked." This appearance of being a bit addled and naïve has helped her in more than one occasion in her life.
To occupy her time, she works now and then as a freelance journalist, usually for small English weeklies but occasionally for a larger newspaper. This gives her a good reason to do the travelling she would have done anyways and also givers her entry into interesting places meeting fascinating people. The inquisitiveness that makes her good as a reporter also make her prone to find out things others don't want discovered.
Luckily her gift of languages, of which she spoke several as if a native, and her instinctive ability to see the truth helps get her out of the same trouble her nose-poking bring on. As her travels go on and she inadvertently becomes involved in intrigue with various leaders and organizations, her abilities eventually bring her to the attention of British Intelligence and she begins to assist them while going about her life.
As the series progresses, she begins to age, meets and falls in love, marries, has a child, and sees her husband killed. Even burdened with grief and the need to raise a child on her own, her natural drive will not be halted and she endures most satisfactorily.