8 sound discs (approximately 9 hr.) : digital ; 4 3/4 in.
Executive producer, Diane McKiernan ; directed by Garet Scott.
Read by Rebecca Soler.
Rio has always dreamed of leaving the underwater city of Atlantia for life in the Above; however, when her twin sister, Bay, makes an unexpected decision, Rio is left stranded below where she must find a way to unlock the secrets of the siren voice she has long hidden and save Atlantia from destruction.