This was a very enjoyable look into a day of the lives of an old married therapist couple capped off with an exhilarating finish. As great as the ending was, the relationship between The Doctor and the Spirit in the introductory segments felt rather static. It makes sense, since we're stepping into a single day of a years-long relationship, with the only impetus for change coming at the end, but the pacing does nonetheless suffer a bit for it.