Brandon Sanderson

The only life Tress has known on her island home in an emerald-green ocean has been a simple one — collecting cups brought by sailors and listening to stories told by her friend Charlie. But when his father takes him on a voyage to find a bride and disaster strikes, Tress must stow away on a ship and seek the Sorceress of the deadly Midnight Sea. Amid spore oceans where pirates abound, can Tress leave her simple life behind and sail a sea where a single drop of water can mean instant death?