The Costello Family

The Costello family have been looking for their principessa ever since she was kidnapped at the age of 2 by a rival mafia.

What happens when Greyson Costello gets a phone call one night saying his daughter Arianna has been arrested and has no family but him to take her in?
Will she still be the sweet, innocent daughter he once knew or will she have changed?

I'm so bad at descriptions :)