I am about halfway through Settling Accounts – Return Engagement, which has just been published in the USA and available in the UK from Amazon
I am really enjoying it and Turtledove does a very good alternate World War Two.
You can purchase the UK edition in October (which has a much better cover in my opinion).
I am a bit of a fan of Turtledove, but didn’t enjoy American Empire as much as previous books until I read the final part.