When their spaceship nears Venus, radio interference from the planet cuts the crew off from Earth. By then, Sikarna's efforts lead to a stunning discovery: The spool describes a Venusian plan to irradiate the Earth's surface, with the extermination of mankind being the prelude to their invasion. Rather than containing a "cosmic document", as had been expected, the spool bears a cold-blooded message of destruction. With this new information the crew decides to transmit this information to Earth, believing that the information would be of service to mankind. Harringway, however, convinces the crew to press on towards Venus rather than return to Earth with revelations that could panic mankind, leading to unknown consequences.