undersea colonies

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.

Trained since the age of three to be Daughter of the People, sixteen-year-old Evelyn Winters believes her underwater world of Elysium is perfect until Gavin Hunter, a surface Dweller, stumbles into Elysium and she realizes that everything she knows is a lie perpetrated by "Mother.".

"A group of kids who have been genetically altered to survive in the ocean must embark on a dangerous underwater journey to find refuge--and maybe even a way to save the world"--Provided by publisher.