Lucky Starr series

The barren crust of Mercury lay covered by a network of wire designed to harness the dazzling blaze of the sun and send it sizzling through hyperspace. But someone, or something, on tha airless world was sabotaging the top secret mission. Where no life was said to exist, impossible “ghosts” had been seen, and murderous snakes of alien rock had condemned the innocent to death. It is to this troubled planet that Lucky Starr is sent by the powerful Council of Science. Who or where the enemy is…no one knows. And in order to find out, Starr must face the most deadly—and insane—opponent of his young career!

The sixth novel in the extra-terrestrial odyssey of David Starr. Sabotage of a revolutionary advance in space travel means every life is at hazard. Only a handful of highly trusted men were supposed to know the secret. But, someone else knew! For David Starr it was probably the most important and dangerous mission he had ever faced. He had to find the mysterious saboteur before the damage became irreparable. But the unknown enemy didn't seem human. Not even remotely alien, either! This is the final volume in the star-blasting series of David 'Lucky' Starr, Space Ranger.

The third novel in the Lucky Starr series, six juvenile science fiction novels by Isaac Asimov that originally appeared under the pseudonym Paul French. Shortly after returning from the Asteroid Belt, David "Lucky" Starr learns that his Science Academy roommate Lou Evans had been sent to investigate trouble on Venus, but the Council of Science office on Venus has requested that he be recalled and investigated for corruption. As Starr and John "Bigman" Jones are shuttled to Venus, their pilots suffer an episode of paralysis, and Starr is required to keep their craft from smashing itself against the surface of the Venusian ocean. Afterwards, the pilots have no memory of the event. Upon reaching the Venusian city of Aphrodite, Starr and Bigman meet Dr. Mel Morriss, head of the Council of Science on Venus, who explains that Venusian scientists are perfecting strains of yeast that can be processed into luxury foods for export; whereas for six months there has been a growing series of incidents of bizarre behavior among the human colonists, often followed by amnesia. Morriss believes they are being telepathically controlled by an unknown enemy.

Earth officials were hard on the heels of the mysterious Sirian spy, Agent X, when he blasted off in a stolen spaceship. But before they could catch him, the master spy jettisoned the capsule that held his report into the icy rings of Saturn. In a flash, Lucky Starr and Bigman Jones found themselves in a race with the Sirian war fleet to recover it. When the Sirians couldn't find the capsule, they kidnapped Lucky and Bigman, bringing them to their secret military base on Titan. There the arrogant Sirian commander offered Lucky a terrible choice: turn traitor to Earth—or Bigman would die! It was not an idle threat.