Tiffany Sinn is an agent of the CIA.
Eventually, she is. When we first meet her, she is a private investigator who will get mixed up in a case involving Rex Swift from the CIA. Later she would change jobs and become a full-time agent herself.
In her own words told in her first recorded adventure: "My name is Tiffany Sinn! I'm 26 years old, an orphan and one of the best private detectives in the business! My parents were executed by the communists in East Berlin in 1954! Ever since that time, I had been determined to make a career of spying and espionage ... in an attempt, I suppose, to gain revenge for the death of my father and mother! However, as a private eye, I didn't get much change to fulfill my quest of vengeance, nor did I have the opportunity to find love and romance! Little did I know that a routine office visit from two thugs would bring me the opportunity to gain all three as the CIA sent me 'To Save An Agent'." (Lot of !'s there)
Sinn wears her dark hair in a very stylish short pixie cut which not only looked great on her but also had to have been useful by not getting in the way in an altercation. She dressed well but practical although climbing stone walls in a skirt had to have been hard on the knees. She shows several times that she can handle herself, especially when the shooting starts. Her soon-to-be-fiancée, Swift, must agree because at the end of the first adventure, after she had come along to save him, chimed, "I'm gonna marry you and put an apron on you! You're too dangerous with a gun!"
While Sinn not only does not take exception at that sexist remark, she agrees to get married but in the second recorded adventure, she finds herself in the arms of a different agent and even as she remembers her fiancée, she does not object to the smooching showing she is definitely her own person and able to do what she wants.