Christiane Bauer is now 60 years old.She lives in Berlin and manages an architecture office.She is divorced and has a 11 years old son Martin.Iris Naumann, a 27 years old single woman is her right hand in the office and also a good friend of Christiane.Iris knows that Martin is gay and is living with his friend Kai Schmidt (but Christiane doesn't know it.Christiane has thought that Martin and Iris could be a good couple and that they could assume the office after her retirement.But, surprise, Iris has fallen in love with Chrisph Balthus, a millionaire who is 30 years older than Iris.Christiane doesn't understand this relationship between the young woman and an older man.