The author's many historical novels have been set against a variety of periods and places. This one deals with Philadelphia at the time of the Revolution, and the British plans for a surprise attack on Washington's army at Whitemarsh. The heroine is fifteen year old Deborah Stone, whose escape from her tyrannous aunt eventually leads her under the protection of the Darraghs, a respected Quaker family secretly spying for the Patriots. Deborah's own stint of undercover work, although not terribly suspenseful, is at least reasonably incorporated into the story. The characters who have been drawn from history, like the Darragh family, have been well handled, but some of the fictional ones seem irrelevant as, for instance, the menacing but amorphous hired hand Rob Bates. There aren't many books based on the Revolutionary battles for girls, and this one will draw them into both the setting and the action.