I love the Galactic Bonds series and especially Only Cold Depths. 

Vesper and Kryion had finally made it to Sygnustern where they seeked refuge with Asterin’s House. There they hope to find out more about their Truebonds. They were also hoping to find peace but that didn’t happen.  This story had it all - spies, suspense, bounty hunters, corporate mercenaries, a kidnapping and daring rescues.  Blend everything thing together you have a fantastic thrilling tale. Tried and true.