Test pilota Pirxa

Undercover of a space mission to Saturn where he has to place two observation sondes in orbit in the Cassini path situated between the planet's rings, Pirx, an astronaut whose reputation and experience is highly recognized, is given a secret mission of another nature : observing his crew and determining whom of its members is an android. By the quality of his judgement it will be decided - or not - to stop the development of these sophisticated robots and their manufacture in mass, perspective that could change the face of humanity...