Eileen "Bundle" Brent is an amateur detective.
Her "day" job is the young daughter of Lord Caterham, latest titled man to hold dominion over the stately manor known as Chimneys. That fancy abode and estate grounds is "a place where kings and queens go for weekends, and diplomatists forgather and diplome". Daddy is Clement Edward Alistair Brent, the ninth Marquis of Caterham and a man less looking like a nobleman one is not likely to find. He is a small man who routinely dresses shabbily and has little pleasure in his position. It was his brother, the late eighth Marquis, who had been the powerhouse of his generation, being for a time the Secretary of State for Foreign Affairs and involved in all manner of high level goings-on. Clement Brent prefered to stay out of the way but when his sibling's death thrust him into his title, he reluctantly took it.
Eileen Brent, nicknamed Bundle, is a young woman likely around 19 years of age and very much not reveling in her position of "Lady". She is described as more of a "red-hot Socialist" than a member of nobility. "Tall, slim and dark, with an attractive boyish face and a very determined manner" is how she is pictured when we first meet her.
Bundle has no aspirations for getting involved in cloak and dagger work but she most definitely gets intrigued with mysteries and with murder and the two different recorded cases we have put her in the midst of both as well as going up against spies and other secretive sorts. Thinking closer about it, though, Bundle would definitely have made a very good operative because she is not only inquisitive and intuitive, she is so delightfully not what people would consider "spy" material, she would get away with it.