Allyson Braithwaite Condie

"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"--Provided by publisher.

Poe Blythe, the young captain of the Outpost's last mining ship, wants revenge far more than the gold they tear from the Serpentine River. She has vowed to annihilate the river raiders who robbed her of everything two years ago. But as she navigates the treacherous waters of the Serpentine and realizes there might be a traitor among her crew, she must also reckon with who she has become, who she wants to be, and the ways love can change and shape...