Tui T. Sutherland 
Wings of Fire 2 [EPUB ebook] 
The Lost Heir

The Wings of Fire saga continues with a thrilling underwater adventure. Stolen as an egg from the royal hatchery, Tsunami is going home at last. She is eager to reunite with her mother, Queen Coral. But her return doesn’t go the way she imagined. An assassin has been killing off the queen’s heirs for years, and Tsunami may be the next target.