Amidst the French revolution, Citizen Robespierre is beheading the aristocracy! When word gets to England, noblemen Sir Rodney Ffing and Lord Darcy Pue take it upon themselves to aid their French counterparts. Sir Rodney is a master of disguise, and becomes 'The Black Fingernail' scourge of Camembert and Bidet, leaders of the French secret police.

Sidney James
as Sir Rodney Ffing, the Black Fingernail

Kenneth Williams
as Citizen Camembert

Jim Dale
as Lord Darcy Pue

Charles Hawtrey
as Duc de Pommfrit

Peter Butterworth
as Citizen Bidet

Joan Sims
as Désirée Dubarry

Dany Robin
as Jacqueline

Peter Gilmore
as Citizen Robespierre

Marianne Stone
as Landlady

Michael Ward
as Henri
CinemaSerf
I found this to be one of the cleverer "Carry On" films with Kenneth Williams on good form as the revolutionary "Citizen Camembert" aided by his sidekick "Bidet" (Peter Butterworth) making sure that all the nasty aristos turn up for their appointment with madame guillotine. The fly in their ointment...