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Puppet Masters (original 1951; edition 1986)
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Amazon.com Product Description (ISBN 0345330145, Mass Market Paperback)Earth was being invaded by aliens and the top security agencies were helpless: the aliens were controlling the mind of every person they encountered. So it was up to Sam Cavanaugh, secret agent for a powerful and deadly spy network, to find a way to stop them--which meant he had to be invaded himself!
(retrieved from Amazon Thu, 14 Apr 2011 05:39:55 -0400)
When alien slugs with mind control abilities begin infecting people, Sam and Mary, federal agents whose work is only known to the President, try to stop the invasion and kill the aliens without harming their hosts.
(summary from another edition)
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