In the future discrimination is based on genetics, not race or class. Parents see geneticist to filter out undesirable traits in their children. Vincent's parents decided to go trust mother nature and concieve naturally. Vincent is seen as genetically inferior and is doomed to a life of servitude. His parents have a second child and choose to consult a geneticist. this child is his parents pride and joy. Vincent is treated as if he's fragile and will die any moment.
Vincent dreams of going into space but he is seen as unfit. He finally gets the courage to go out on his own when he beats his "genetically superior" brother in a swim race.
He decides to use one of the genetically elites identities to get into the space program. It's a complex procedure, in which he uses the donors body fluids to fool gene testing machines. He is set for a flight when the director of the program is murdered.
While the investigators are working Vincent loses an eyelash leaving his DNA. The murder investigation focuses on him. The detective is sure that Vincent is the guilty party. It becomes harder for him to diguise himself.