With their old enemy defeated, Dean and Jules can finally look ahead… Jules is back from an alternate dimension, having tied off all loose ends. She didn’t return alone. Together with this new ally, the Alliance of Worlds begins training a new fleet to defend against inevitable future threats. With the revelation something alien may be residing within Slate, Dean and the team must follow a trail of clues to determine just where it hails from, and how dangerous it truly is. Can Slate survive long enough to fight the invader? And will Jules learn to cope with being a normal teenage girl?