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Peter Cawdron is very much a hidden gem of current sci-fi. He specialises in asking what if when it comes to people meeting aliens for the first time, and creates such believable characters that anything apparently made-up or fictional about the situation in which they appear is just overlooked as you find yourself wrapped up in the story.

 

       What if aliens landed in the Middle Ages?

       What if a few isolated aliens were orbit in a small spaceship could they wipe out humanity?

       What if aliens spread like weeds?

 

 

A lot of his books are listed here.