Ruler by day, a reluctant pirate by night, 18-year-old Princess Ariana fights to protect the secret heir to the waterfall city of Lunadar. But it only takes one ill-fated meeting for Ariana to suddenly be plunged into an escalating web of secrets found in her father’s journal, a deadly kidnapping, and an ever-weakening resolve to turn her back on the call of the merman’s song. How will she bring her father’s murderer to justice and fulfill a deathbed promise to protect Lunadar’s legacy?