An alien work crew comes to earth and starts leveling buildings, but it's all for the purpose of saving Earth. The aliens know that a white dwarf star is on a collision course with Earth so they want to mount a cannon to deflect the star from its path. But they miss. Earth's last chance is Rick Jordan, who's invented the Graviton, a device that can create a temporary zero gravity field and allow Rick to plant explosives on the dwarf star.
Frank Barrows wakes to a voice telling him that the future depends on him. Frank builds an android duplicate of himself which is sent to the future, but Frank and the android can communicate with each other across time. In the future, light-beings from Aldebaran are "inhaling" argon and "exhaling" monargon, a poisonous waste. Future historical records show that Barrows had developed a technology that could help, but the android duplicates a Frank before he had started that research. Frank is able to knock an electron off an argon atom and get poisonous chlorine and chase away the light-beings.
Star's luck is holding steady. He hasn't had a case in a week and he's had to pawn Ilda, his robot secretary. Luckily, Star is hired to locate a fugitive who's thought to be hiding on Vesta, an asteroid mining settlement, in the Red Jungle. But with a little tracking skill and the help of the creepy vegetation of the Red Jungle, he nabs the fugitive, gets his prisoner, and gets Ilda back from the pawn shop, promising never to pawn her again.