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[gutoffowc69]

I got an audiobook from my local library, in early 2000s, (Moved so I can't access their data base) of a story about a spaceman returning to earth, and there are questions regarding:
Is he really a human or is he an alien masquerading as one?
Has he been changed by contact with an alien race?

He starts on a grand mission to to reduce conflicts and wars on earth, to get people and governments to work together...

I know he was a new author to me; so that rules out:
Ray Bradbury, Arthur C Clarke, Asimov, Philip K Dick, Heinlein, Douglas Adams, Ursula Le Guin, Frank Herbert,
(obviously all the early writers; HG Wells, Shelley, Jules Verne, Bergerac)

 

[Danny McG]

You sure about Heinlein?
What you've said made me think of Stranger in a strange land

 

[tinkerdan]

Clifford Simak has a couple that are like that.
The prominent one in my mind is Werewolf Principle.

https://www.amazon.com/gp/product/B00YTFT9ZE/ref=x_gr_bb_kindle?caller=Goodreads&tag=x_gr_bb_kindle-20

 

[gutoffowc69]

Clifford Simak has a couple that are like that.
The prominent one in my mind is Werewolf Principle.

https://www.amazon.com/gp/product/B00YTFT9ZE/ref=x_gr_bb_kindle?caller=Goodreads&tag=x_gr_bb_kindle-20

Close, but the returning man/mot-man is not in a future earth, so not Simak I'm afraid. Thanks

 

[Orcadian]

The Werewolf Principle by Clifford D. Simak. sounds good: "Grand Master Clifford D. Simak offers a moving, stunning, witty, and thought-provoking exploration of what it means to be human."

 

[Hugh]

My own thoughts are "Time and Again" Clifford D Simak. One of my favourites...

 

[psychotick]

Hi,

If we're thinking Simak - Time is the Simplest Thing? He's sort of a spaceman, even if he visits alien worlds by astral travel. So did he meet an alien pink blob who greets him - "Hi pal, I trade my mind with you?"

Cheers, Greg.

 

[Ray Zdybrow]

This reminds of "Who?" by Algys Budrys and also "the Three Stigmata Of Palmer Eldritch" by Philip K Dick.
In both, iirc, the returnee has metal features and can't be identified as the person who left.