I read this book when it was initially published, in the ‘80s. For me, it was one of the “alternate history” type books I read (“Thrice upon a time” was the 1st I read and loved that book). I really liked the book at the time, and it was one of the catalysts that got me into the “alternate history” stories.
I loved this book so much that I bought 3 ciopies to pass aroung to family and friend's. IT gets slow near the middle for a minute or two, Stck with it. Warner Brothers bought the option.