"Geronimo Stiltonix's spaceship is in danger of exploding! The only solution is to replace the engine's batteries by tracking down a rare element. When a group of mysterious aliens claim they can help, Geronimo is relieved. But are the aliens as friendly as they seem?"--Back cover.

Malachi Constant, "the richest man in America," gives up his indulgent lifestyle to follow an urgent calling to probe the depths of space. He participates in a Martian invasion of Earth, mates with the wife of an astronaut adrift on the tides of time, and follows the lure of the "Sirens of Titan."

"All her life, Spensa has dreamed of becoming a pilot. Of proving she's a hero like her father. She made it to the sky, but the truths she learned about her father were crushing. The rumors of his cowardice are true--he deserted his flight during battle against the Krell. Worse, though, he turned against his team and attacked them. Spensa is sure there's more to the story. And she's sure that whatever happened to her father in his starship could happen...

You must go to a mysterious galaxy to try to stop aliens who are taking all the oil reserves on Earth.

"When the space station Heimdall is invaded, Hannah and Nik must work together to defeat the enemy"--

"Two star-crossed lovers must fight for survival when they crash land on a seemingly uninhabited planet"--

When Captain Jim Holden's ice miner stumbles across a derelict, abandoned ship, he uncovers a secret that threatens to throw the entire system into war. Attacked by a stealth ship belonging to the Mars fleet, Holden must find a way to uncover the motives behind the attack, stop a war and find the truth behind a vast conspiracy that threatens the entire human race.

As Naomi and her fellow teen astronauts investigate the fate of their predecessors on the Europa colony, back on a deteriorating Earth, Leo works with a renegade scientist to warn the crew about hostile extraterrestrials.

Traveling to the planet Jurassix to warn its inhabitants of an imminent comet strike, Geronimo Stilton and his crew encounter ferocious, dinosaur-like beasts who have an appetite for rodents.

In the aftermath of a sabotaged NASA rocket launch gone, Captain Calli Chase comes face-to-face with her missing twin sister, as well as the startling truth of who they really are, and now with a top secret program put in motion years ago has spun out of control, Calli embarks on a frantic search for the missing link between the sabotaged rocket launch and her predetermined destiny--a search that someone else is very interested in stopping.