Gan's limiter malfunctions, and the crew go to space station KX-72 to have it repaired, at the risk of being discovered.
Gan's limiter brain implant places his life in jeopardy. The implant is designed to limit aggressive impusles, but when it malfunctions he attacks the crew and is in urgent need of neurosurgery.
The only source of the replacement parts and medical expertise needed to save Gan, is the neutral medical and weapons research centre - XK72.
To reach XK72 they must navigate an area of space designated by Zen as containing unacceptable danger. The crew continue but Zen shutsdown, deciding that entering the zone is the same as a self-destruct command.
After a short while in the Zone, the Liberator begins to pick up speed - the effect of a massive gravitational vortex. The Liberator just manages to get through by aiming right at its centre.
Once at XK72, the crew must persuade the researchers to treat Gan without putting themselves in danger. They attempt to pass the Liberator off as an advanced Federation prototype ship to deflect suspicion.
However they do not fool Doctor Kayn - the surgeon who must treat Gan. Kayn contacts the Federation and delays the operation to buy time for the Federation Pursuit ships that are coming.
Blake, resorting to threats, eventually forces Kayn to commence the surgery. The operation is a success and Kayn returns to XK72, only to have the base destroyed by a stray Federation missile.
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