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Double Star (edition 1986)
Double Star by Robert A. Heinlein
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Amazon.com Product Description (ISBN 0345330137, Mass Market Paperback)One minute, down and out actor Lorenzo Smythe was -- as usual -- in a bar, drinking away his troubles as he watched his career go down the tubes. Then a space pilot bought him a drink, and the next thing Smythe knew, he was shanghaied to Mars.
Suddenly he found himself agreeing to the most difficult role of his career: impersonating an important politician who had been kidnapped. Peace with the Martians was at stake -- failure to pull off the act could result in interplanetary war. And Smythe's own life was on the line -- for if he wasn't assassinated, there was always the possibility that he might be trapped in his new role forever!
(retrieved from Amazon Thu, 12 Mar 2015 18:12:05 -0400)
An actor is coerced into impersonating a kidnapped politician. When the politician dies, his staff persuades the actor to continue and to carry out the politician's ambitions.
(summary from another edition)
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