Deep blue /
Jennifer Donnelly.
- First edition.
- New York ; Los Angeles : Disney-Hyperion, c2014.
- 340 pages ; 22 cm.
- Waterfire saga ; book 1 .
Maps on endpapers.
Uncovering an ancient evil, Serafina, a mermaid of the Mediterranean Sea, searches for five other mermaid heroines who are scattered across the six seas, to save their hidden world.