Fire Mountain Aria. Strains of Portomare, #1

A disillusioned eldsinger. A freezing world. A desperate search for home. After losing their family in an accident some think they caused, powerful eldsingers Trace and Echo are adrift, moving through the ocean from job to job waiting for better days. Echo can't seem to reach her brother Trace, the most powerful eldsinger on Portomare, and watching him sink and lose hope is killing her. When a small reef, a community living within a hollow stone far beneath the surface of the ocean, asks for their help, they discover a mystery, and Trace finally shows some interest in life again.
However, with this mystery comes danger, as Trace accidentally catapults himself into a hidden world and can't get himself out. Those in the lost reef have never met anyone from the outside before. Their reef is dying, freezing, and they have no hope save an injured eldsinger. Time is running out for the reef, and unless Trace can find answers and get himself home, two reefs-and Trace himself-might be lost forever. Fire Mountain Aria is book one of the Strains of Portomare, fantasy about an underwater world and the powerful men and women who travel its currents.