Baron Leijoncloo comes back to Sweden after many years in Argentina. On his way to his good friend Victor Sällberg's home, he loses his luggage. A con artist, Jönsson, finds it, and uses the baron's title to get invited to the manor of Mr. and Mrs. Blomqvist. By a coincidence, the baron also comes to the manor pretending to be Mr. Blomqvist's new private secretary.