H2O: After the Tide

Ten years after they left Mako Island behind, the tide is turning again."
The ocean has secrets-and so do they.
Emma's back with a daughter and a past she can't outrun. Rikki's walking the line between loyalty and freedom. Cleo's balancing motherhood, science, and the growing fear that their secret won't stay hidden much longer.
When strange tides begin to stir and a new mermaid emerges from the depths, the women must reunite to confront a power they thought they'd left behind.
The moon is shifting. The water is waking.
This time, the magic isn't just theirs.