Thorgal had a chance to destroy the Atlantean spaceship and its weapons, but couldn't bring himself to do it, as it also meant sacrificing Jolan. His aborted attempts, however, activated Neokora, the onboard artificial intelligence. First contact was immediately hostile, and the two Vikings soon had to flee both the machine ... along with the last survivors of the crew, long thought dead but now awakening. Including Slive the Sorceress, who was once Thorgal's ally, then his enemy ...