David has a trip away, which brings back bad memories for the person he's accompanying

“Em, you’ll be a great mother, you took great care of Kevin. I couldn’t have done a better job. That was the first time he went to bed without an argument.” Mary said. “How did you do it?”
“Trade secret.” I giggled, “We mothers need to have some secrets.”

Chapter Nine: Cindy and Harry’s blossoming friendship consumes David’s final days at the Clinic. But once they've had their final date, will it be time to say farewell to Cindy for good?

I turned back to Ally and Sandy, “Hey guys, I think I have a real problem and I mean a real serious problem.” They both stopped laughing and looked at me. They could tell I was serious.
“What’s wrong Em?” Sandy asked.

David arrives at the Finishing Centre. So much more freedom there. If he can just hold true to his resolve, all will surely be well. Or will it? Life is never quite so straightforward. Particularly not for David. And freedom is anyhow only relative. "Stone walls do not a prison make, nor iron bars a cage;"