On to the summer TBR reads at last! It's a book that I first read over a decade ago, when I was on a determined alternate history reading binge, and re-reading it again reminds me of why I was so underwhelmed by it. It seems that nearly every alternate history novel involving Britain and the Second World War involves a resistance and the effort to ferret out either the Holocaust or an atomic bomb project. This one is the latter, and while Sansom does some interesting things with it, he's a little too eager to show off his world-building and he burdens his book with character flashbacks that detract from the story's pacing. I'm going to be happy to add this one to the book box once I'm done with it.