To survive she must defeat the evil hidden beneath the city's charming canals...

Allie loved being near the water. Even before she found out she had mermaid genes, seawater soothed her soul. Adria, with its miles of winding canals, should have been heaven. Exploring the city of serenading gondoliers with her boyfriend, Nate, could have been the romance-filled trip of a lifetime.

But this is no dream vacation. Allie is desperate to find her mom who she holds responsible for the death of her twin sister. Amid the distractions of the most romantic city in Europe, Allie and her friends lose focus. A strange series of incidents leads to them getting kicked out of their hotel. They end up homeless. Now an ancient foe pursues Allie through the city’s dark waterways.

Justice Rain, a famous rock star and student of Allie's mother, invites her to stay at his sumptuous palazzo. But the generational bond that connects Allie to her destiny cannot be denied and life with the world's most famous celebrity is full of drama. Justice conceals a dark secret and Nate is consumed by jealousy. Trapped in a foreign city and not knowing whom to trust, everything will depend on her penetrating to the mystery that lurks beneath the city’s oldest palazzo.