Fisherman Ärni has decided to take weekenders for midsummer due to the poor catch of fish. The plan is not bad, but extremely troublesome guests arrive at his beautiful farm in Muhumaa: Mrs. Sohvia, her husband Johan, their son Junior and Sohvia's beautiful sister Erna with her businessman Cavalier Ivo. At first glance, it is clear that Ärn and his wife Lainel are having a hard time with the vacationers.