2317 - The dreadnought Relentless leaps into hyperspace during one of the last battles against the alien Skiloi, its destination unknown, and is presumed lost with all hands by humanity.

2337 - Relentless returns to human space, and as its commander begins to blaze a path of destruction across the stars towards Skiloi territories the Solarian Alliance rapidly mobilizes every starship it has in a desperate attempt to stop the rogue starship from restarting the war with their former enemies.

As Relentless proceeds inexorably onwards, aboard the TSS Satori, ex-marine Ridley Martini is asked to undertake a perilous mission by her captain: Board Relentless, lead a squad to the bridge and overthrow whoever is in charge when she gets there.

The mission's goal is simple: Failure is not acceptable, and Relentless must be stopped at any cost...