Moselfahrt mit Monika

Heiner and his friend Florian go canoeing on the river Mosel. With them is Monika, Heiner's sister, as Heiner's wife hasn't got time to be with them. But as a joke, Heiner passes Monika off as his wife, and while Monika likes the conceit initially, it becomes a problem when she falls in love with Florian who however wa…