The year is 2258, ten years after the destruction of Earth by the Minbari fleet. The last refuge of Humanity is a devastated colony on the planet Proxima-3. President Mary Crane is the head of the Resistance Government. The remnants of the Earth Military continue to fight against the Minbari using raiding tactics. Relations with Narn allies are far from ideal. The last hope of Humanity is one single ship and one single person. This ship is Babylon, this man is its captain. John Sheridan.

Sheridan is trying to find out who betrayed him. In his search, he reaches the Kha'Ri himself. At this time, the time of difficult trials comes for Delenn - she is in the hands of cruel investigators of the earthly Security Service. Someone is ready to fight the Enemy, and is gathering strength for this. But he does not suspect that the Enemy is already at his very doorstep.