Deep and wide-ranging world-building, a complex and thrilling plot, and an uncoventional, convincing and immersive representation of slavery and exploitation. I especially liked how Jemisin managed to capture my attention and keep me guessing on three levels simultaneously: deep civilisational history, impending apocalypse, and finally family and personal sacrifice.
The Broken Earth Trilogy: The Fifth Season, The Obelisk Gate, The Stone Sky
Great second book in the series. The plot thickens, and characters I had written off in the first book have their stories filled in and woven back into the main storyline again. Masterfully done - again, this book won a Hugo for a very good reason.