Veterans Ben Corbin and Sam Garrett rotated out of the corps after being replaced by robots and drones. They’d gone into business together towing derelict vessels and space junk out of the shipping lanes around Mars.

Business was good but a couple of malfunctioning service robots had caused them to return to Earth for replacements. Aliens attacked the freighter they’d booked passage on, slaughtering and feeding on the crew and passengers. Only Corbin and Garrett managed to hold their own until they could hide in stasis pods.

200 years later

 Earth and her colonies, governed by the Commonwealth of Nations, are at war with a race of aliens known as the Nineteenth. Not with the Gar Rei Jhi who had attacked Corbin and Garrett so many years past. That war had been fought and humans lost. This was a new alien threat whose origins and motives are unknown.

What information humans have on this new enemy comes from the uneasy alliance with the Gar Rei Jhi who’ve been fighting an even longer war with the Nineteenth. Though long ago, Corbin and Garrett’s history with the Gar Rei Jhi hasn’t been forgotten. They are to be ambassadors serving at the pleasure of the same aliens that attacked them.

Thrust into a new age of engineered soldiers, interplanetary politics, and self-aware robots, Corbin has to quickly decide who he’s going to trust as he journeys back to the Mars colony. But his search for truth may come at the cost of his life, and the fate of the Commonwealth may rest on his decision.