It has been several months since the USS Endeavour pursued and destroyed the Wild Hunt, believed to be a pirate gang marauding a whole sector in the fringe of Federation space. Only a select few know the truth: the Wild Hunt were a unit from a starship from an alternate reality, perhaps the Mirror Universe itself, the ship trapped in this universe, desperate for a way home, and still somewhere at large. On a campaign of misdirection and espionage to protect themselves, they have a doubtless tiny, but unknown number of infiltrators replacing officers in key positions. Unbeknownst to any, this includes Lieutenant Dathan, key strategic advisor to Admiral Beckett of Fourth Fleet Intelligence.

In the time since, many of Endeavour have made a comfortable life aboard. But it is not without its challenges. Commander Valance has yet to reckon with her complex relationship with her Klingon heritage, and her fledgling relationship with Chief Engineer Commander Cortez has seen them both directed to routine counselling. Meanwhile, Lieutenant Thawn has been wrong-footed by a new arrival aboard: Lieutenant Rhade, leader of Endeavour’s Hazard Team and the near-stranger she is nonetheless expected by Betazoid custom to some day marry.

And any possible peace is soon to be shattered by the drums of war of the Hunters of D’Ghor.