A man does a blood heist to get a sample of a virus that will make him immortal and/or rich. Never do a blood heist if you ever have the opportunity or inclination.
Gil Murdock is piloting a space ship onto Ganymere for his employer, Wavenill who lost his visit some years before. Apparently the aliens that live on Ganymede have health aids that will regrow the eyes and allow Wavenill to see again. They are warned that trying too steal from them will case them to be punished, but Murdock thinks he has the perfect plan.
Yes, Murdock is using this good deal to get something for himself. He has to disguise himself and he thinks this is the perfect method. He is in big trouble back on earth. Wavenill goes though to procedure and his vision seems to be coming back, but on the way out, the two realize they are at cross purposes and are soon in armed stand off.
Then Wavenill gets sent out of the ship and it is Murdock and the aliens robot with the robot imprisoning Murdock for something beyond his wildest imagining.
It is a science fiction with a touch of horror and with a big cliff hanger as the ending.