Wild Cards X: Double Solitaire By Melinda M. Snodgrass

(Wild Cards # 10)

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Aboard his grandfather's spaceship and fleeing the violent turmoil between jokers, aces, and nats that his vicious ambition spawned, Blaise is headed for a new conquest: the planet Takis. Dr. Tachyon is left behind... but he's lost more than his only way of returning to his homeworld. Blaise has stolen his body, as well--leaving Tach trapped in the pregnant body of a teenage runaway.

Tachyon must sell his soul to reach Takis--and once there, confront Blaise amidst the political and military machinations of Takisian society. Treachery and treason await him. At stake is nothing less than the destiny of an entire world.