After he crashlanded on a bizzare mission to Britain in Scotland, Hess was taken for interrogation to a well guarded house in the English countryside, the subject of a new book BTW. What would have happened had he remained at Hitler's side during the whole of the war? What was the real purpose of his mission to Britain? How high up in the Nazi hierarchy was he? Was he really murdered in Spandau Prison?
"what would have happened had remained at Hitler's side during the whole of the war?"
well no Martin Bormann...in 1941 Hess, Ribbentrop and Dr Todt, had been largely isolated and marginalized by Goering and Himmler; however by 1943 Goering and Himmler had fallen out, so its possible Hess could come back to some prominence in alliance with one or the other.
Hess as deputy fuhrer and party secretary controlled access to Hitler so that has tremendous butterflies. Also, he was a vocal opponent of some of the really nasty stuff coming out of the SS, so its possible that German occupation and racial policy change during the war somewhat if Hess gets back in tight with Goering
"what was the real purpose of his mission to britain"
even 70 years later there is not a concrete answer to this question that all historians will buy
"how high up the party was he"
he was the party secretary and deputy fuhrer; basically hitler's chief of staff
"was he murdered in Spandau"
no