A comedy about a Danish private detective, normally just occupied with cases about unfaithful spouses, is suddenly involved in murder, arms deal, revolution in Guateragua, briefcase full of money and the Danish intelligence agency.

A good looking female social welfare worker makes Egon Olsen forget about crimes for some time, but when an American gangster breaks into a local bank and the police think its Egon's work, he has to get back to work to prove he's innocent.

Police constable Møller'og psychiatrist Dr. Mogensen will have something to watch as the Pusle to everyone's surprise finds out that she can do magic. On her birthday she gets sent an ancient, magical figure from her uncle in South America. On the same day Pusle's parents has to travel to London, and the large family is now left to strict aunt Alma.