The world of grumpy taxi-driver Hartmut Mackowiak comes crashing down when he finds out his wife is leaving him after 30 years. Suddenly, he has to rethink his whole life – making him even more of a cranky loner. That is, until the day he gets six-year-old Hayat and her mother as a fare in his taxi. While her mother has to go back to Istanbul for a few weeks, Hayat is supposed to stay in Germany with her grandma. But then Hayat's grandma falls into a coma. Although Hartmut initially doesn’t want to have anything to do with the precocious little Turkish girl, he gradually succumbs to Hayat’s stubborn charm and decides to help her. Little does he suspect it may also be a case of the little girl helping the big grouch to learn to enjoy life again…