Defiance by Joel Shepherd

The UFS Phoenix is hunting for the long-lost drysine data-core. Within it lie the secrets to saving humanity from the resurgent deepynine machine-race. To recover it, Captain Erik Debogande must work together with the man who holds his sister hostage - the power-hungry parren leader Aristan. Aristan has sworn he will return Lisbeth Debogande once Phoenix grants him equal access to its prize. But now from the direction of hostile space comes word of a dark force hunting humans and parren alike, determined at all costs that the store of the lost Drysine Empire's knowledge should be possessed by neither.

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