I've been meaning to refer everyone to some recently published books about post-reunification Germany and then just yesterday the PBS Frontline documentary is about the revival of extremism there:
https://www.pbs.org/wgbh/frontline/documentary/germanys-enemy-within/
This review was one of the pieces I had in mind:
https://www.lrb.co.uk/the-paper/v45/n24/neal-ascherson/wessis-and-ossis
It covers these two books:
Beyond the Wall: East Germany 1949-90
by Katja Hoyer.
Allen Lane, 475 pp., £25, April 2023, 978 0 241 55378 7
Out of the Darkness: The Germans, 1942-2022
by Frank Trentmann.
Allen Lane, 837 pp., £40, November 2023, 978 0 241 30349 8
I'll add the others when they come back to mind.