When fifteen-year-old Ty, who has always lived on the ocean floor, joins Topside girl Gemma in the frontier's underworld to seek and stop outlaws who threaten his home, they learn that the government may pose an even greater threat.

In a future of high technology and genetic modification the Coral Kampii, like legendary mermaids, live isolated from the Above World, but when the devices that allows them to breathe underwater start to fail, thirteen-year-old Aluna and her friend Hoku go to that forbidden place to find help

Great Britain, the last days of the twenty-first century. Sea creatures swim among the ruins of Big Ben and the Tower of London, and citizens waver between fear and hope; fear of what lurks in the abyss, and hope that humanity will soon discover a way to reclaim the Earth. Leyla McQueen is chosen to participate in the London Submersible Marathon, she sees is an opportunity to save her father, who has been arrested on false charges. When the race takes...

Millennia ago, mankind fled the earth's surface into the bottomless depths of the darkest oceans. Shielded from a merciless sun's scorching radiation, the human race tried to stave off certain extinction by sending robotic probes far into the galaxy to search for a new home among the stars. Generations later, one family is about to be torn apart in a conflict that will usher in the final race to save humanity from a world beyond hope.