Eva Kiesler is an agent with British Intelligence.
The Second World War is on the horizon and approaching quickly when she takes up duties with that organization.
Kiesler was once married to a man named Friedrich who owned armament factories. That former mate had been troublesome, her words, and she "wouldn't have another, not for a while". That union had ended back in 1937 when she escaped to Paris "fleeing her domineering husband in the dead of night dressed as her maid".
She works for a man known as the Brigadier, full name being Angus Thromburton CVO, DSO. He had approached her back at the time of her self-rescue, offering a position with his new organization and promising that she would find it a lot more fulfilling than her intended career as an actress. She politely declined and headed to the West Coast of America where she found shortly thereafter that beautiful women were eye-candy, "seen but not heard". She was glad she had kept his business card.
She is described as "tall and slender" but as shown in the first recorded adventure, a fair amount out of conditioning. "The Brigadier had threatened to put her in for morning calisthenics. That sounded like so much less fun than sleeping in, but she had to reconsider her opinion It was necessary to keep up with the men she wanted to lead and impress." She also had an opportunity to wish she had spent more time at the firing range - while her shooting ability is good, she was "no trick-shooting Annie Oakley" and she had learned there were times such a skill is useful. She was quick to realize that out in the field, especially behind enemy lines, "she couldn't rely on being one of the most beautiful women in Hollywood, anymore".
Regarding that last statement, her history before she took up her current role as an operative had her as one of the most successful and most famous actresses in the film industry. In her new job, that fame and admiration worked often against her because "once me recognized her, they could never get over it".
Once she made the decision to not devote her life to acting but to also serve her country as relations with Germany became more strained Kiesler was placed with a team of operatives; by the time we join up with her, she is by no means a novice at field work.
Our time with Kiesler and that team will also see the introduction of and joining of Dr. Slate, a most interesting individual. Not only is he a genius and can prove it easily, he is also unique. He is "technically the clone of one of the most famous scientists of the day, a much-younger copy of Nikola Tesla" and shares "all the older man's memories up until the fateful [day in] August 27, 1922" when a secret invention of Tesla caused his creation.