Charley and his friend Jack fall in love with the beautiful Spittigue girls, Kitty and Annie, who are jealously guarded by their father. What's more, the young men are not interested in money, so they have no chance of winning the goodwill of their grim father. But a visit from Charley's aunt, a wealthy millionaire, gives the youngsters hope. They hatch a brilliant plan, but it seems to be ruined when Donna Lucia, the aunt, fails to arrive. The young men soon get over this little problem and persuade their friend to play the part of the aunt. All goes well until the real Donna Lucia arrives.

The protagonist was sent to South America after the war. Now he is back home and wants to meet his old love. At the same time, he takes on the job of looking after his in-laws' children, two very bad boys, while their parents are on holiday abroad. What will become of it? Anyone who meets the "fantastic aunt" at the beginning of the film, as well as Huba and Csaba, will have an inkling.