In the 1950's, Isaac Asimov, writing under the pseudonym Paul French (later the books were republished under the Asimov name), wrote six science fiction novels for teenagers about a young agent of the "Council of Science," an organization which has considerable power in a world in the distant future. The agent, David Starr, travels throughout the Solar System to combat crime and to protect Earth. Asimov was using these stories to teach the readers facts about the Solar System. Nevertheless, in an introduction written in 1978, Asimov apologizes for the science inaccuracies in this first volume that are now apparent after all of the space probes to Mars. But, as of 1952, it was accurate. (Actually, this introduction to a later reprinting of a science fiction novel is rather unique. I can not recall another author who makes an effort to point out the changes scientific investigation have provided since the original publication of a story. Asimov should be commended for this. In so doing, he continues to teach.) In this first story, David Starr must discover who is the cause of a series of fatal poisonings on Earth and who is blackmailing the farms on Mars. In so doing, he accidentally comes in contact with ancient Martians living beneath the surface.