When a distress call is caught by the Iludrin, the team can't ignore it, but no one is prepared for what they find. The signal leads them to an unstable star system, where a slaver vessel drifts aimlessly. Despite multiple life-signs, no one answers their inquiries.

Saving the prisoners is a priority, but when rescue teams board the derelict vessel, they soon discover why no one has answered. Something deadly is lurking in the grim corridors, killing crew and prisoners alike. The rescue teams from the Iludrin could be next. However, when a secret is discovered on the ship, they can't leave it for the Issan to claim, or the mysterious threat on the ship will be the least of their concerns.