Carry on Don't Lose Your Head

In the new French Republic during the Revolution, members of the French aristocracy are being rounded up and publicly executed by beheading via guillotine, these executions overseen by the head of the secret police, Citizen Camembert. Learning what is happening across the channel, Sir Rodney Ffing and Lord Darcy Pue, English dandies and layabouts, decide, using various disguises, to rescue their aristocratic French counterparts from execution, they leaving a calling card of a diagram of two upturned fingers in a sign of victory, one finger with a black fingernail. As such, Ffing, the unknown rescuer, is given the moniker the Black Fingernail. Ffing and Pue return to England with the Duke de Pomme Frits after rescuing him for his own protection. Believing the diagram to be a sign of English aristocracy, Camembert and his sidekick, the dim Citizen Bidet, go on a mission to apprehend the Black Fingernail. Camembert finds what he believes to be the Black Fingernail's weakness after it is discovered that he has fallen in love with a French maiden, Jacqueline, who is used as a pawn to lure the Black Fingernail out into the open.