Dark Space by Jasper T. Scott

From USA Today Bestselling Author Jasper T. Scott
HUMANITY IS DEFEATED
Ten years ago the Sythians invaded the galaxy with one goal: to wipe out the human race. The survivors are hiding in the last human sector of the galaxy: Dark Space—once a place of exile for criminals, now the last refuge of mankind.

Freelancer and ex-convict Ethan Ortane owes crime lord Alec Brondi 10,000 sols, and his ship is badly damaged. When Brondi catches up with him, he makes an offer Ethan can’t refuse. Ethan must infiltrate and sabotage the Valiant, the ISSF carrier that guards the entrance of Dark Space, and then his debt will be cleared. But before Ethan can live up to his end of the deal, he discovers that the real plan was much more sinister than what he was told, and he will be lucky to escape the Valiant alive…