Midnight on the Firing Line

As tensions between the Klingon and Romulan Empires worsen due to growing aggression from the Klingons over the weakened state of the Romulans, the Endeavour is dispatched to the Klingon/Romulan border at the request of the Romulan government in an effort to keep the peace. However, a coup within the Klingon government overthrows Chancellor Martok and threatens to place the Endeavour in the middle of the opening shots of a new war between old enemies.