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Tenacious is the twelfth book in the Kris Longknife Series. Kris Longknife makes plans to explore what is believed to be the home world of the Aliens. More warships and tenders from various planets of the United Society as well as the Scanda Confederacy, the Helvetica Confederacy and Esperanto League.

Kris, who has not yet completed her sixth year in the Navy, while remaining a captain for pay, is frocked to vice admiral by King Raymond I.

Kris takes a task force to examine the home planets of the marauding Aliens. After examining a planet that had been wrecked by nuclear and kinetic weapons, they proceeded to...