Commander Elias is a member of the Legion, tasked with defending and policing hundreds of star systems in a frontier part of the galaxy, a region between two human and three alien civilisations called the Drift.
When war breaks out between the human civilisations and most Legion officers return home, only a handful are left behind to protect the Drift. With a fleet of deadly aliens set to invade in a matter of days, Elias must hunt down the only man with access codes for a vital arms cache.
Unfortunately he has company. Elias and his crew are forced to share a ship with Sienna and her friends.
A con-artist and a thief, Sienna is on the run from bounty hunters.