Thirteen-year-old Nina is imprisoned by the Population Police, who give her the option of helping them identify illegal "third-born" children, or facing death.

Twelve-year-old Kyle Camden develops greater mental agility and superpowers during a plasma storm that also brings Mighty Mike, an alien, to the town of Bouring, but while each does what he thinks is best, Kyle is labeled a villain and Mike a hero.

Thirteen-year-old Meg Murry, her little brother Charles Wallace, and their friend Calvin are guided by unearthly strangers as they go on a journey through space and time to search for Meg's and Charles' scientist father who disappeared while experimenting with a new form of space travel.

Ten-year-old Akiko has an unexpected adventure when she is whisked away to a distant planet and put in charge of the rescue mission that must search for the kidnapped Prince Froptoppit.

When she and her family move to Oregon, Maya discovers that the kids in a nearby apartment building perform magic and use portals to visit other worlds, a situation that is complicated by Maya's efforts to safeguard an alien.

In 2041 twelve-year-old Dashiell Gibson is a resident of Moon Base Alpha, and at the moment he is faced with a number of problems: coping with the nasty Sjoberg twins, finding out how the commander of the base has managed to disappear from a facility no bigger than a soccer field, and dealing with the alien Zan who communicates with him telepathically from afar--and who is hiding a secret which may threaten the whole Earth.

Fourteen-year-old Laurie and his family attempt to flee England when the Tripods descend from outer space and begin brainwashing everyone with their hypnotic Caps.

Fourteen-year-old Brady and his cousin Quinn love extreme sports, but nothing could prepare them for the aftermath of Brady's close encounter with a meteorite after it crashes into his Black Hills, South Dakota, bedroom.

When extraterrestrial woodchucks attack, ten-year-old Jimmy, his two-and-a-half-year-old sister, friend William, and an eccentric classmate who has built a flying saucer in her Manhattan brownstone, join forces to save the universe.

Twelve-year-old Kyle Camden is annoyed because his superpower identity, the Azure Avenger (often called the Blue Freak) has been labeled as a villain by the town of Bouring--but when he builds a time machine, so that he can go back and prove that the hero Mighty Mike is an alien, he founds out that all of his assumptions are wrong.