The Testaments

Margaret Atwood makes a much-anticipated return to the world she created in A Handmaid's Tale with this. Not so much a sequel in any direct sense, but a larger examination into the dystopia she created, the story follows the lives of an Aunt, a schoolgirl, and an outsider and we learn more about the society of Gilead that gets created.

The Aunt Lydia storyline was amazingly well-done, and provided a lot of insight into what a system like Gilead's would do even to those in privileged positions. She doesn't quite become a sympathetic character, but serves as an interesting reminder that the bastards will grind you down if you let them.
Agnes' story was really interesting as well. Seeing the perspective of someone raised in Gilead, and who accepts the basic tenets of that society without question, is horrifying in ways that even the original novel failed to achieve.

The only part of the book that I didn't particularly care for was the epilogue - it felt tacked on, and lacked a lot of the understatement and subtlety that Atwood featured in her storytelling to that point.