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.

• The Rank Organisation
• Adder
• Sidney James
• Kenneth Williams
• Jim Dale
• Charles Hawtrey
• Peter Butterworth
• Joan Sims
• Dany Robin
• Peter Gilmore