Let's get the easy part of the review out of the way.
Great TV. Great writing. Great characters. Great acting. Ritter can hold her own with Tennant and Tennant is no slouch. It has already been renewed. What more can anyone ask?
Well two thoughts as I was watching this episode.
First this series has turned into the most complicated love story since Silence of the Lambs. And I will point out that the final chapter of that series, Hannibal (the book, not the movie!!) had the two heading off into the sunset together. (Check it out yourself)
And, I said this before, I still miss the series that the writer "teased" us with off the top. For one or two episodes I thought this was a distaff version of the 40s film noire PI flick, with a PI who used to be a superhero. That series, minus the Kilgrave arc, would have been a winner entirely on its own. I would have loved to see it.