Rhea's Vault — D.M. Pruden

Saturn's moon, Rhea, hides many secrets… The Vault is the most secure archive in the Solar System, or so everyone believes.  Melanie Destin desperately needs to get inside and knows someone who can help her.  But when she gains access to the facility, what she discovers should not be possible. Something has destroyed the archive, and now it hunts her.With her ship sabotaged, Mel must survive long enough to escape Rhea with the secret she's uncovered. If she fails, a force will be unleashed that will kill millions, and forever change the balance of power in the Solar System. Mel Destin will need to use every trick at her disposal for any hope to get out of this one, but will it be enough?