A very interesting book written by a personal touch from Richard Lebow due to his family background.
The scenarios seem plausible.
I have only noticed a small geographical error. He writes in one of the scenarios that Tondern/Tønder in Denmark is occupied by German forces. If there was no First World War this town would still have been part of Germany. It became part of Denmark due to the border change after the First World War in 1920.
The book is very well written and you read it like a novel. The facts about the every day life are very interesting details for instance that the number of references to Hitler in the death notices dropped from 82 pct in 1940 to 16 pct in 1944.