Waterbomb for the Fat Tomcat

Marta and Linda's parents have gone abroad to earn a living, so the sisters need someone to look after them. For that they have their dictatorial spinster aunt Una, who desperately wants to get married, and has feelings for jeweler Ivo. Meanwhile, Marta is working hard to get a promised puppy, but her plans are ruined, as her aunt strongly despises dogs, so relations between the girls and their aunt become tense. The sisters try to figure out how to help their aunt get married so they can be rid of her.