Resurrecting the plot of a classic television science fiction series, this novel follows a group of scientists who detect a radio signal from a distant galaxy. The signal turns out to contain instructions for the design of an advanced computer, but when the computer is built, it merely delivers another set of guidelines—this one for the creation of a living organism named “Andromeda.” One of the scientists soon suspects that the organism's purpose is much darker than they realize: to overpower and enslave the human race. Coauthored by a noted astronomer and based on one of the most popular science fiction series ever broadcast on British television, this suspenseful story illustrates what can happen when an alien intelligence reaches into human minds, revealing that a silent, invisible conquest of Earth may already be underway.