Prometheus Award Best Novel (nominee)
Tristan has no identity, no face, no family, no rights. He is a perfect spy: an artificially created human whose metamorphic DNA can be programmed with "masques"--genetic copies of anyone--over and over again. Until his body breaks down. But Tristan's masters offer him humanity, citizenship, and a permanent shape in exchange for one last mission. Now, Tristan must play a masquerade that will save--or destroy--an entire people.
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Deep as the Marrow
Mary Elizabeth Murphy
Used availability for Matthew J Costello's Masque
April 1998 : USA Hardback
June 1999 : USA Mass Market Paperback
June 2010 : USA, Canada, UK Kindle edition