The year is 2305, and humans have long since found out that they are no longer the only sapient race in the universe. As humans join forces with other alien races to fight a common enemy known as the carians, two military mights emerge. Council Militia and sentinel fleet take up the fight, driving back the carians and slowing their attacks, but they are unable to completely stop them, thus having to always battle small factions throughout the galaxy.

Six children, three humans and three aliens, having grown up with one another and later on as adults serving aboard two of sentinel fleet's large battlecruisers, once again find themselves thrown together along with a derelict spaceship that they rebuild, and they will find as events start to unfold and secrets are revealed that it will be their strong connection to one another that will either carry them through to the end or destroy them and those they care about.