Sequel to A Fish Out Of Water. Its been several months since the marine center was shut down and Rita and the girls fled. Now up and running again, with Diana as the manager, the new center is running better than ever. But when a mermaid is washed ashore, gravely injured, and taken in for treatment; Janice attempts to prove her mermaid claims and regain her credibility at any cost.

What if Zac's transformation on the full moon during the night when the girls were banished wasn't exactly an accident? And that Zac is Aquata and Sirena's long lost half brother? Find out more as Zac and Sirena try to be a family, and when they find out that their father is an evil merman who is planning on taking over Mako for himself.

Even though Harry is gone, Rita will always be thinking of him. This is Rita and Harry's story before the tragedy.

As Lyla and Zac grow closer, Lyla begins to wonder if his transformation truly was an accident. Romance blooms and secrets are revealed. (Post-Season One, Zac/Lyla)

Denman is back in town, causing more drama for the girls. Lewis is still trying to figure out what the moon is doing and Rikki is pregnant with Zane's baby, but who gets kidnapped and how will they be saved?