Hostage To The Stars by Veronica Scott
He rescued her from space pirates ... but can he keep them both safe from the far greater evil stalking a deserted planet?
Space travel without Kidnap & Ransom insurance? Not a good idea. University instructor and researcher Sara Bridges can't afford it, so when pirates board her cruise liner, she's taken captive along with the mistress of a wealthy man, and brought to a deserted planet. When a military extraction team sent to rescue the mistress refuses to take Sara too, she's left to the mercies of a retired Special Forces soldier, along as consultant.
Reluctantly reactivated and coerced into signing up for the rescue operation to the planet Farduccir where he once was deployed, Sgt. Johnny Danver just wants to get the job done. But when the team leader leaves one captured woman behind, he breaks away to rescue her himself.
As Johnny and Sara traverse the barren landscape, heading for an abandoned base where they hope to call Sectors Command for help, they find villages destroyed by battle and stripped of all inhabitants. A lone survivor tells a horrific tale of the Sectors' alien enemy, the Mawreg, returning after being pushed out ...
Searching for evidence to give the military, Johnny is captured. He regains consciousness in a Mawreg cage–with Sara next to him. Death is preferable to what the aliens will do to them... And even if they do escape their captors, can they alert the military in time to prevent another invasion of the Sectors?
Standalone sequel to Mission To Mahjundar (mild spoilers for Mahjundar in this story.)