This episode is somehow the break point for Carol. She is spending so much time with Kovac and he is offering his help, they seems to have so much great time. And she really seems to make Kovac be able to talk about the past what makes it more and more interesting for us. And the way it ends - I think it was waited for a long time.
Ob the same time, when it looks like Carol's life is getting better, Carter is hearing voices, having flashbacks and digs in the past and in the life of the stabber to learn why he did it. Greene's father is getting worser. And maybe it was the most beautiful part of the episode, when Mark takes his father to the water.. and to the ride over that lake, sea? Beautiful