I looked for this a couple of times last week after a friend mentioned Sansom's historical detective stories featuring Shardlake. I couldn't find it. I wondered if I'd given it away. Then, as usual, it turned up, just when I'd stopped searching. So I'm reading it again.
I find myself involved with the characters in the way I used to be when much younger.
I finished it. The ending is sad in several ways, plus an odd twist at the end. I find Sansom's writing impressive.
Guardian interview with the author