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 wants to remain loyal to his friend. Things get complicated when the
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