An artificial radio signal from Barnard's Star listing prime numbers (although the term "prime" is never used in the story) is received at the Mesa Radio Astronomy Observatory. One of the radio-astronomers is a Russian spy and tries to inform his superiors; however he is uncovered by his fellows and subsequently killed. The CIA hires James Bludd, a prominent astrophysicist, to try to understand what is going on. Several plotlines follow and intertwine, most of them centering on personal greed. News of the extraterrestrial message leaks to the outside world, with different consequences. A bum and a waitress build a cult, calling themselves the Star People, which seeks to find a new home on the Barnard's planet. Multinational, a corporation, decides to invest money into the cult, in order to have an easy to manipulate spaceship crew ready to take possession of the inhabited planet on be