Fire and Blood

This was an interesting companion piece to Martin's abandoned Song of Ice and Fire series*. It's written from an in-universe perspective, chronicling the history of the earliest Targaryen rulers of Westeros. Written as a history book, it initially feels dry and lifeless, but as you get more engaged with it (and as Martin gets to the more interesting parts of Westerosi history), it becomes sometimes fascinating. On the whole, the Targaryens are a great argument against hereditary monarchy, and it's interesting to see the Westerosi narrator struggle to attempt to justify their failings and present them as beneficial parts of the development of his society.

Due to the scope of the material that Martin's going over, he unfortunately doesn't have space to include all the parts of the history that fans are most interested in - there's no Aegon the Unlikely or Rhaegar Targaryen here, which is a bit of a shame. On the other hand, he does include a comprehensive look at the Dance of Dragons that is epic in scale and rivals anything he's written in this world.