The war with the geth is all but over; the Systems Alliance and Commander Emilia Shepard both try to adapt to the new status quo. Desperate to get a breather from the fallout of the Battle of the Citadel, Shepard orders the Normandy back into the endless black ocean. But there's something not quite right in the Traverse, and it's up to the Normandy and her crew to put an end to it.