Cleo Sertori, Rikki Chadwick ed Emma Gilbert, tre sedicenni australiane che affrontano i problemi tipici della loro età, un giorno rimangono intrappolate in una grotta sull'isola Mako e, mentre escono nuotando, vengono trasformate in sirene dalla Luna piena ed acquisiscono poteri legati all'acqua.

Eleanor Selwyn and Draco Malfoy had three things in common: a high, pure-blood status, academic talents and Slytherin house. Other than that, they were complete opposites and hated each other. That was rather unfortunate, as the Selwyns and the Malfoys had been part of the same social circle for decades. They went to the same parties, visited the same shops and restaurants and visited each other far more than Eleanor would have liked. If it were up to their mothers, they'd already have been betrothed, but ever since birth, the two were like fire and ice. But what happens when ice gets too close to fire?