Waiting on Wednesday: Atlantia 

"Waiting On" Wednesday is a weekly event, hosted by Breaking the Spine, that spotlights upcoming releases that we're eagerly anticipating.

Release date November 4, 2014

From Goodreads:

A standalone YA novel.

"In Atlantia, the heroine, Rio, is thrown into a precarious and upsetting situation after her twin sister, Bay, opts to leave their underwater world for "Above" first. Since only family member can leave for the surface, Rio is then, as PYRG executive director of publicity Shanta Newlin explained, 'left with increasingly dangerous questions about the complex political and religious system constructed to govern the fragile divide between land and sea.'"