On the eve of Bajor's entry into the Federation, Sisko begins experiencing visions that lead him to ruins of the lost Bajoran city of B'hala. However, when the visions that are guiding him become potentially fatal, Sisko must choose between his faith in the Prophets or his life.

The discovery of an infant Changeling gives Odo a chance to correct what he sees as the invasive mistakes in his upbringing. Meanwhile, Kira goes into labor with the O'Briens' baby.