The fact is the A-bombs killed far less people than would have died if the invasion had happened, or even if the plans for blockade and conventional bombardment had continued.
My wife's aunt and cousin died at Nagasaki, but even she believes this now.
I read that one, also a good novel called "The Burning Mountain". Trying to get my hands on a book called" Death is Lighter than a Feather" another novel based on the innvasion of Japan.