I finished GRRM's Fire and Blood. It's a slightly odd book, there is enough raw material in here to provide plots for several novels and I think a more conventional narrative than the fake history could have made it more compelling. However, that would probably have required a few thousand pages and a couple of decades to write, so that wouldn't really have been an option. I did enjoy this more than I had expected since I had previously read the shorter excerpts that were published in anthologies and found them a bit underwhelming, but I think the stories work a lot better when put in context. I think the book was strongest in its two longest sections. The first was the tale of the reign of Jaeherys and Alysanne which has been briefly mentioned in the main A Song of Ice and Fire series as a period of piece and stability, but here it is made clear that things weren't quite that straightforward, and Alysanne becomes one of the more interesting characters in the story. The second was the civil war known as the Dance of Dragons, this is probably the best paced section of the story as a mixture of bad luck and stubborn pride quickly sees Westeros falling apart. I don't think I'd really recommend this for casual fans of Game of Thrones, but I think people more interested in the background of Martin's world should enjoy this book.
For something a bit smaller in scope I also read Lisa Tuttle's The Witch at Wayside Cross. Like the first book in the series, this is a Victorian detective story with an occult theme and a strong debt to Arthur Conan-Doyle. This time there is a Baskerville-like relocation from London to rural England, in this case investigating some murders in the small Norfolk village of Aylmerton and also investigating the village's mysterious Shrieking Pits (apparently a real thing). It was a reasonable good book to read, although I was a bit disappointed that the plot did rely on two completely unconnected crimes happening to occur almost simultaneously, which felt a bit unlikely.
I've now started Richard Morgan's Thin Air, which so far feels a lot like every other Richard Morgan I've read, except on Mars.