In Antwerp, Belgium, in 1959, a succession of Interpol agents are gunned down without obtaining what they're looking for: a list of all the influential crooks. Only one remains, Larry Laine, who is about to show them what he's made of.

Set between Christmas and New Year, the film told the story of six criminals who kidnap an ambassador's daughter and await the ransom; enter Monsieur Wens, who infiltrates their hideout using various comic disguises, bumps them off one by one and rescues the little girl.