Frances is a character with a great deal of maturity for all her youth. At 21, she is well aware that society expects her to marry rather than engage in activities that she is repeatedly told are unsuitable for a young woman. She is determined not to let any disadvantages hold her back, and sensible enough not to take unnecessary risks. She is supported by her assistant, Sarah, who provides a strong right hook when the need arises, and a team of young street urchins reminiscent of Sherlock Holmes’ Baker Street Irregulars.