During the Dominion War, the Federation set a trap for its enemies and secretly armed the neutral planet Tezwa with high-tech weapons — violating its non-aggression pact with the Klingon Empire in the process. Now Tezwa's ruthless prime minister is flexing his world's military muscle and threatening both Federation and Klingon border worlds — and Captain Picard and the Starship Enterprise crew are caught in the middle of what could be their last battlefield.