1) When A Stranger Comes To Town

When a seemingly innocent 14 year old girl comes back to Chicago asking after hospital resident Will Halstead she also stirres up dark secrets of a past the Halstead's have tried to put behind them. But she refuses to be buried in their memory any longer. Who is this girl? What happened to her? And what does this have to do with the Halstead duo? It is a duo, right...?