I don't know if this is alternate history or horror but I know it's a gripping and interesting read.
The three novella are well written and the world building is excellent.
I discovered two new to me author, requested it because I'm a fan of Turtledove, and I will surely read other books by them.
It's a book that it's strongly recommended.
Many thanks to the publisher and Netgalley for this ARC, all opinions are mine