Oskar Sláma — called Rambo by the boys and rather worse by the girls — has failed his way through school badly enough that his parents have sent him to live with his grandparents in the rural village of Kotěhůlky for the summer. He does not object, because accepting comes with an inheritance attached. A typical Czech comedy adventure follows as Oskar navigates village life and the conditions of collecting what his grandparents left for him.