When fifteen-year-old Rachel is forced to move to Boston in 1872, she is furious. She is also lonely, for her beloved horse, Peaches, has been sold. But Rachel soon finds a horse that needs her, and needs her desperately: The Governor's Girl, a famous firehorse, has been badly burned. Rachel gets permission to care for the Girl in a stable behind her house.

As she cares for the injured horse,Rachel dreams about becoming a veterinarian. But her father, a newspaperman, has very definite ideas about where women belong: only in the home. Father also has definite ideas about Boston's inadequate firefighting equipment, as an outbreak of suspicious fires erupts. To make things worse, horses everywhere begin falling ill -- and it is horses that power the city's fire engines. Another spark might send the whole city up in flames.

With cinematic vividness, Diane Lee Wilson brings the very real Great Boston Fire to life in this exciting and inspiring story of a strong-minded girl determined to decide her own future.