Harry Sandwith, a Westminster boy, becomes a resident at the chateau of a French marquis, and after various adventures accompanies the family to Paris at the crisis of the Revolution. Imprisonment and death reduce their number, and the hero finds himself beset by perils with the three young daughters of the house in his charge. After hairbreadth escapes they reach Nantes. There the girls are condemned to death in the coffin-ships, but are saved by the unfailing courage of their boy protector.