When thirteen-year-olds Jonah and Chip, who are both adopted, learn they were discovered on a plane that appeared out of nowhere, full of babies with no adults on board, they realize that they have uncovered a mystery involving time travel and two opposing forces, each trying to repair the fabric of time.

Being connected to Daemon Black sucks...Thanks to his alien mojo, Daemon's determined to prove what he feels for me is more than a product of our bizarro connection. So I've sworn him off, even though he's running more hot than cold these days. But we've got bigger problems.Something worse than the Arum has come to town...The Department of Defense are here. If they ever find out what Daemon can do and that we're linked, I'm a goner. So is he. And...

To support herself and her younger brother in a future Beverly Hills, sixteen-year-old Callie hires her body out to seniors who want to experience being young again, and she lives a fairy-tale life until she learns that her body will commit murder, unless her mind can stop it.

Connie Willis draws upon her understanding of the universalities of human nature to explore the ageless issues of evil, suffering, and the indomitable will of the human spirit.

“A tour de force.”—The New York Times Book Review
For Kivrin, preparing to travel back in time to study one of the deadliest eras in humanity’s history was as simple as receiving inoculations against the diseases of the...

Twenty years after the start of the war that caused the Collapse, fifteen-year-old Stephen, his father, and grandfather travel post-Collapse America scavenging, but when his grandfather dies and his father decides to risk everything to save the lives of two strangers, Stephen's life is turned upside down.

"High school senior Cara Sweeney gets more than she bargained for when she agrees to participate in earth's first intergalactic high school exchange program"--

The number of zeroes on the Babel Corporation's contract has Emmett Atwater boarding their lightship and hoping to return to Earth with enough money to take care of his family-- forever. But it turns out he's one of ten recruits, all of whom have troubled pasts and are a long way from home. Now each recruit must earn the right to travel down to the planet of Eden-- a planet that Babel has kept hidden. There they will mine a substance called Nyxia...

Time travelers Jonah and Katherine arrive in 1611 to rescue missing child John Hudson, son of the explorer Henry Hudson, but just as the mutiny on the Discovery is supposed to start, Jonah and Katherine's knowledge of history is tested once again, and they fear that more is at stake than just one boy's life. Author's note includes facts about Henry Hudson's explorations.

"In a world where disease has been eliminated, the only way to die is to be randomly killed ('gleaned') by professional reapers ('scythes'). Two teens must compete with each other to become a scythe--a position neither of them wants. The one who becomes a scythe must kill the one who doesn't"--

On a post-nuclear Earth, visionaries who dream of reaching for the stars attempt to revive the forbidden technology that destroyed their world.
Centuries ago, humankind was nearly destroyed in a nuclear apocalypse.  Many generations have passed since that terrible time, and the remnants of civilization have re-formed into separate, vastly different societies. The dominant culture of a widely diminished Earth, the ecologically sensitive...