When the tail of the comet Bhaktul flicks through the Earth's atmosphere, deadly particles are left in its wake.

Suddenly, mankind is confronted with a virus that devastates the adult population. Only those under the age of eighteen seem to be immune. Desperate to save humanity, a renowned scientist proposes a bold plan: to create a ship that will carry a crew of 251 teenagers to a home in a distant star system. Two years later, Galahad and its crew―none over the age of sixteen―is launched.

The multiple-award-winning young adult science fiction adventure series follows the teenage crew of the starship Galahad in their quest to find a new home for humanity among the stars. If they fail, it will be the end of the human race.

What reviewers say:

Part space opera, part mystery, the story draws readers in from the beginning with well-placed hooks, plenty of suspense, and a strong premise.

School Library Journal

What began as a fairly straightforward tale of 251 teens shot into space to escape a ravaging disease on Earth became a deeper, broader, scarier, and more intellectually stimulating journey with every book. Few YA SF series in recent memory have been this satisfying.

Booklist, Starred review

Grabs readers' attention with the very first page and never lets go. Both a mystery and an adventure, combining a solid cast of characters with humor, pathos, growing pains, and just a hint of romance.

Kirkus Reviews