The novel follows the adventures of a group of scientists and engineers who are sent to the planet Saint Patrick to investigate a mysterious signal that has been detected coming from the planet. The signal is believed to be of alien origin, and the team is sent to investigate. Once on the planet, the team discovers a strange alien race living in a hidden city beneath the surface. The aliens are friendly, but they are also hiding a secret that could have devastating consequences for the human race. The team must find a way to stop the aliens before it is too late. The novel is a classic example of 1950s science fiction, with a thrilling plot and a cast of interesting characters. It is a must-read for any fan of the genre.
By Murray Leinster · First published 1960 · Genre: Science Fiction, Adventure, Mystery