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