The Storyteller (UK edition)

Anna and Abel couldn't be more different. They are both 17 and in their last year of school, but while Anna lives in a nice old town house and comes from a well-to-do family, Abel, the school drug dealer, lives in a big, prison-like tower block at the edge of town. Anna is afraid of him until she realizes that he is caring for his six-year-old sister on his own.