The young Tony will travel from Budapest to the countryside to marry his cousin Katinka, the oldest of the seven sisters Gyurkovics. Because Tony is already secretly married to another, the situation is problematic.

Mizzi is the impish middle sister of seven who is glad to leave boarding school and has many adventures making her way back home. This includes impersonating a countess and meeting Count Horkay who is impersonating her cousin Tony, his friend whom Mizzi's mother intends to marry her oldest sister. The younger set all have their own ideas of who they love despite the plans of the older folks.