At risk of being uncovered as a Tory spy, Michael joins the Sons of Liberty aboard ship in Boston harbour. Will he help rebels jettison 112 crates of East India Company tea? On the route of one of the earliest railroads in the United States, he reaches Lowell, the birthplace of the American Industrial Revolution. An historic streetcar conveys him to the Boott Cotton Mills, where he discovers a flagrant act of industrial espionage and militancy among the thousands of women and girls who worked there.