Jonah (Life Sciences).

Prose  Who knows (other than the author) how the Doctor stumbles into stories like this?  Did he just happen to be in the area and stumble upon young Jonah randomly or was he already on the trail of some medical malfeasance?  Either way, this the kind of "low key" adventure about the Doctor taking an "ethical and moral" stand and choosing to save one life over another even though, given that he has access to "all of time and space, everywhere and anywhere, every star that ever was" he could probably find a way to medically save both (justice for Abigail).  Of course, if the Doctor would be breaking some kind of temporal prime directive if he went around curing all diseases,  but at least he'd be living up to his name.  A framing device tries to explain his choice is justified but there's still something inherently unDoctorish about his solution.

Placement:  Let's give him the benefit of the doubt and put it early, in the moments when he's still trying to work what kind of man he is.