Leslie Frost is an agent for a secret U.S. intelligence agency.
According to her opening statement in the first chronicle, Leslie Frost is one of two remaining out of seven. The group of seven, painstakingly compiled by a meticulous and stern leader Frost calls Maxine the Queen, were all codenamed the seven female ivy league colleges. Frost was Smith. The others, such as Vassar and Wellesley, had all died on missions. Frost didn't expect to live much longer, considering the fate of her 'sisters'.
The daughter of a noted American diplomat, Frost heard of the United States more than she saw it growing up. This almost nomadic life took her around the world and made her understand the international situation better than most people her age. When she was back in the States, she marvelled at how little her peers knew or thought of the world outside their view.
She was also gifted from an early age with a love and a talent for music. Even as she was honing her espionage tradecraft, she was becoming a major player in the concert halls of the world. While hardly at a level of a rock star, she nevertheless was able to get into many places most people couldn't, using her fame in the classical music world to take her where she might otherwise be suspect, giving her an edge. Still, the same could be said for the 'sisters' who are no longer.
Interestingly, though she lives in the world of high culture and sophistication, bringing the most genteel music to affionadoes around the world, Frost personally loves to wear leather, ride a powerful motorcycle, and hang out at her brother's nightclub.