What I would have liked to have seen at the end {{ Spoilers }}}
There's this huge and unsatisfying gap between the couple going to court & Hannah pleading for clemency for them, and then suddenly Isabel is (somehow?) dying ~ Ouff!
They were a loving couple before this moral crisis challenged them. And they made a wrong choice, but out of love: Tom's love of Isabel and Isabel's love of Lucy.
So, when they were restored to their marriage, a huge opportunity that Hannah would never have since her loving spouse had perished, I would have loved to have seen them mature as a couple.