Meet David "Lucky" Starr- the youngest man ever to become a member of Earth's council of Science, a dauntless detective in the face of a hostile universe.

Lucky Starr and Bigman Jones journey to the remote moons of Jupiter to find the spy who is leaking the vital secrets of the hyperatomic engines of a prototype spaceship to the enemy Sirians

David's first mission as a member of the Council of Science is to stop the random poisonings on Earth. People depend on food from Mars and if word leaks out that the food could be lethal, panic will follow.

"You must go to the dragon. You must leave tonight." Before she even hears the words, Kaeldra already knows what she must do. She must search out the mother dragon whose draclings have just hatched and somehow get some of her precious milk. It's the only way to save her foster-sister's life. Kaeldra would rather not go. It's much too terriffying, much too dangerous. But Kaeldra knows that she's the only one who can do it. For she is the only one who can actually communicate with dragons. But little does Kaeldra know what she's getting into. She's about to begin a journey that will entwine her fate with that of three little draclings and one would-be dragonslayer. A journey the will become a struggle for life.

Newly arrived on Planet Anderson Two just before Christmas, Jonathan is warned about the dangerous native inhabitants, but an accidental meeting with one of the natives convinces him that they are friendly and peaceful.

In David Starr, Space Ranger, the ruling Council of Science sends David Starr to the rescue of the planet, and Starr battles the space pirates who killed his parents in Lucky Starr and the Pirates of the Asteroids. Reprint.