Cara's so overjoyed to be a dragonrider at last, she doesn't notice Breena's jealousy. And when Cara deliberately loses a competition to help her friend, Breena's not grateful – she's insulted, and lashes out at Hortense, who sets about sabotaging the girls' friendship. Disqualified from competition, Breena and Moonflight suffer a terrible fall. Cold and hurt, the two seek shelter in the Cave of Sighs. But the tide is rising, threatening to wash them away! Cara must sacrifice the championships and seek instead the help of the merfolk in order to rescue her best friend and her beloved dragon!