Unbreakable is hardcore military SF straight from the loins of Heinlein and Pournelle and Drake, but with a smattering of genes from A. Bertram Chandler and Poul Anders and Christopher Anvil...making it not a slavish imitation, but rather a smart synthesis of its ancestors. -- Asimov's Science Fiction
A B&N, Kirkus, io9, and Verge
"Best of Pick" for Science Fiction & Fantasy
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Lieutenant Paen barely survived her encounter with the Lusitanian Empire. The nightmares won't stop. And she's got a newly reconstituted unit of green marines to whip into shape before they deploy. If the enemies of the RAW don't kill them first, she just might do the job herself.
Light-years away, on the edge of the Verge, a massive vein of rare ore is discovered on the mining planet of Sheol, which ignites an arms race and a proxy war between the Republic and the Lusitanians. Paen and Victor Company are ordered to Sheol, to help hold the planet at all costs.
On the eve of their deployment, a friendly fire incident occurs, putting Paen's career in jeopardy. When the Lusitanians send mercenaries to raid Sheol and destabilize its mining operations, matters reach crisis levels. Disgraced and angry, Promise is offered one shot to get back into her mechsuit. But she'll have to jump across the galaxy and possibly storm the gates of hell itself.