The Devil You Know

In the grinding middle of the Dominion War, Jadzia Dax is asked to weigh a discovery that could tip the balance toward Starfleet, a biogenic weapon, against everything she believes a war should not be allowed to cost. Grieving losses of her own, she has to decide how far compromise can go before it stops being survival and starts being surrender. A novella from the DS9 anniversary anthology Prophecy and Change.