I have, terribly belatedly, read April’s GGK book club novel, TIGANA. Well, re-read it, because it’s down on my Reading List four times and I’ve read it at least twice that many times, because the reading list didn’t get started until well after the book came out. TIGANA is, pretty much without a doubt, my favourite book. I’ve never previously tried to do any kind of figuring out why, but as I was reading this time I had the question in the back of my head, and it became clear…