A Strange Kind of Colonel (1968)

A pair of thieves sees a mysterious crook ,"the Angel " steal their job ;every time they plan a robbery, their rival has just come before and let them his card which reads "with the Angel's compliments".The "boss" and his idiot sidekick want to avenge themselves;they know that their enemy has stolen a precious stone and concealed it in a colonel's mansion ;so they kidnap the military man (just back from India) and take his place to be able to search the house .But a lot of unexpected intruders come to the house ,including the (true) colonel's fiance; the Angel must be among those people who impose themselves in the mansion.