After Susan sees Mr. Smith the substitute teacher peel off his face, she knows he's an alien and only Peter believes her. Together they work to save the class from Mr. Smith's horrible plans.

Aliens fly to planet Earth to try on all different colors and sizes of underwear.

Author and professional futurist Karl Schroeder, whose novels Ventus and Permanence have established him as a groundbreaking visionary in hard science fiction, extends his imagination into Larry Niven territory, returning to the same distant future in which Ventus was set, but employing a broader canvas, to tell the story of Teven Coronal, a ringworld with a huge multiplicity of human civilizations. Brilliant but troubled Livia Kodaly is Teven's...

Set in the universe as Sheffield's previous novel Cold As Ice, Dark As Day is a hard science fiction novel set 30 years after the Great War, and interplanetary war that nearly destroyed the entire human race, and left horrifyingly dangerous weapons caches to threaten human survival. The Solar System is finally recovering from the Great War, a war that devastated the planets and nearly wiped out the human race, and the population of the outer moons,...

'I must find my own kind!' Found as an infant drifting in space, Acorna, the Unicorn Girl, has become a young woman. She still has her tiny, translucent horn, and her 'funny' feet and hands. And, she still has her miraculous ability to make plants grow and heal human sickness. But Acorna has strange dreams of a gentle folk who mind-speak by touching horns. With her 'Uncle' Calum, one of the three grizzled asteroid prospectors who rescued, protected,...

The SS Cygni probe sent back hours of video, captured by the Biolathe AI, but only a few minutes mattered-the four minutes that showed a creature made of fire, living, moving, and dancing in the plasma fire of the double star's accretion disk. A dragon made of star stuff, so alien that only a human expedition to observe and perhaps capture it, and could truly understand them. It's a perilous journey into the future, however, for SS Cygni is 245 light-...

Raz, a mathematician, is among a cohort of secluded scientists and philosophers who are called upon to save the world from impending catastrophe.

In the extraordinary Worldwar tetralogy, set against the backdrop of World War II, Harry Turtledove, whom Publishers Weekly has called the "Hugo-winning master of alternate SF," wove an explosive saga of world powers locked in conflict against an enemy from the stars. Now he expands his magnificent epic into the volatile 1960s, when the space race is in its infancy and humanity must face its greatest challenge: alien colonization of planet Earth.Yet...

From C.J. Cherryh, one of science fiction′s greatest writers and a 3-time Hugo Award "Best Novel" winner, comes the exciting and long-awaited follow-up to Hammerfall, the second novel of the Gene Wars. In the second volume of "The Gene Wars," C. J. Cherryh further explores the captivating new universe where two interstellar empires, scarred by nanotechnology weaponry, hover in an uneasy detente. Perched at the edge of the galaxy, tiny Concord Station...

Based on all six of the Star Wars movies, tells the story of Anakin Skywalker from his birth in slavery to his death as the powerful Darth Vader.