In Boston in 1775, orphaned fourteen-year-old Hannah is indentured to the family of a British general and begins attending secret meetings disguised as a boy, then passing messages and warnings to the revolutionaries using her beloved horse Promise. In 1775, on the eve of the Revolutionary War, Americans are preparing for battle. The disagreements between the Whigs and the Tories are intense, anxiety is running high, and fourteen-year-old Hannah Andrews is suddenly in the middle of it all. After her mother's death, Hannah is indentured to the Boston family of British General Thomas Gage, and she finds her loyalties torn between her respect for the Gage family and the belief that Americans should be free from British rule. Hannah begins attending secret meetings of the Sons of Liberty disguised as "Hans, " the stable boy's cousin. Together with her beloved horse, Promise, Hannah takes a bold step to join the fight for freedom and, in an exciting climax, she and Promise set off on a dangerous mission to pass a warning back to her neighbors in her hometown of Salem as the revolution begins.