Continuum trilogy

"Aero leads a group of insurgents from the Second Continuum to overthrow his rival, Supreme General Vinick, and unite his space colony's military forces while Seeker embarks on a secret mission to her home colony to reinforce Earth's defenses and protect the First Continuum against an even greater threat. Meanwhile, Myra's nightmares have become a reality as the Dark Thing hurtles toward Earth with designs on eradicating the planet's fledgling populace. The only thing standing in the way are the three Carriers and those who would join them to fight against a second coming of the Doom"--Provided by publisher.

Myra and her friends form an unlikely alliance in hopes of surviving long enough to reach the First Continuum, to learn the secret behind humanity's destruction and the hope for its survival.

"One thousand years after a cataclysmic event leaves humanity on the brink of extinction, the survivors take refuge in continuums designed to sustain the human race until repopulation of Earth becomes possible. Against this backdrop, a group of young friends in the underwater Thirteenth Continuum dream about life outside their totalitarian existence, an idea that has been outlawed for centuries. When a shocking discovery turns the dream into a reality, they must decide if they will risk their own extinction to experience something no one has for generations, the Surface"--Provided by publisher.